Date

Class

Class Date provides methods for storing and manipulating calendar dates.

Consider using class Time instead of class Date if:

You need both dates and times; Date handles only dates.
You need only Gregorian dates (and not Julian dates); see Julian and Gregorian Calendars.

A Date object, once created, is immutable, and cannot be modified.

Creating a Date

You can create a date for the current date, using Date.today:

Date.today # => #<Date: 1999-12-31>

You can create a specific date from various combinations of arguments:

Date.new takes integer year, month, and day-of-month:

Date.new(1999, 12, 31) # => #<Date: 1999-12-31>

Date.ordinal takes integer year and day-of-year:

Date.ordinal(1999, 365) # => #<Date: 1999-12-31>

Date.jd takes integer Julian day:

Date.jd(2451544) # => #<Date: 1999-12-31>

Date.commercial takes integer commercial data (year, week, day-of-week):
```
Date.commercial(1999, 52, 5) # => #<Date: 1999-12-31>
```

Date.parse takes a string, which it parses heuristically:

Date.parse('1999-12-31')    # => #<Date: 1999-12-31>
Date.parse('31-12-1999')    # => #<Date: 1999-12-31>
Date.parse('1999-365')      # => #<Date: 1999-12-31>
Date.parse('1999-W52-5')    # => #<Date: 1999-12-31>

Date.strptime takes a date string and a format string, then parses the date string according to the format string:

Date.strptime('1999-12-31', '%Y-%m-%d')  # => #<Date: 1999-12-31>
Date.strptime('31-12-1999', '%d-%m-%Y')  # => #<Date: 1999-12-31>
Date.strptime('1999-365', '%Y-%j')       # => #<Date: 1999-12-31>
Date.strptime('1999-W52-5', '%G-W%V-%u') # => #<Date: 1999-12-31>
Date.strptime('1999 52 5', '%Y %U %w')   # => #<Date: 1999-12-31>
Date.strptime('1999 52 5', '%Y %W %u')   # => #<Date: 1999-12-31>
Date.strptime('fri31dec99', '%a%d%b%y')  # => #<Date: 1999-12-31>

See also the specialized methods in “Specialized Format Strings” in Formats for Dates and Times

Argument `limit`

Certain singleton methods in Date that parse string arguments also take optional keyword argument limit, which can limit the length of the string argument.

When limit is:

Non-negative: raises ArgumentError if the string length is greater than limit.
Other numeric or nil: ignores limit.
Other non-numeric: raises TypeError.

Constants

MONTHNAMES

An array of strings of full month names in English. The first element is nil.

ABBR_MONTHNAMES

An array of strings of abbreviated month names in English. The first element is nil.

DAYNAMES

An array of strings of the full names of days of the week in English. The first is “Sunday”.

ABBR_DAYNAMES

An array of strings of abbreviated day names in English. The first is “Sun”.

ITALY

The Julian day number of the day of calendar reform for Italy and some catholic countries.

ENGLAND

The Julian day number of the day of calendar reform for England and her colonies.

JULIAN

The Julian day number of the day of calendar reform for the proleptic Julian calendar.

GREGORIAN

The Julian day number of the day of calendar reform for the proleptic Gregorian calendar.

Date._httpdate(string, limit: 128) → hash

ext/date/date_core.c View on GitHub

          
            static VALUE
date_s__httpdate(int argc, VALUE *argv, VALUE klass)
{
    VALUE str, opt;

    rb_scan_args(argc, argv, "1:", &str, &opt);
    check_limit(str, opt);

    return date__httpdate(str);
}

Returns a hash of values parsed from string, which should be a valid HTTP date format:

d = Date.new(2001, 2, 3)
s = d.httpdate # => "Sat, 03 Feb 2001 00:00:00 GMT"
Date._httpdate(s)
# => {:wday=>6, :mday=>3, :mon=>2, :year=>2001, :hour=>0, :min=>0, :sec=>0, :zone=>"GMT", :offset=>0}

Related: Date.httpdate (returns a Date object).

Date._iso8601(string, limit: 128) → hash

ext/date/date_core.c View on GitHub

          
            static VALUE
date_s__iso8601(int argc, VALUE *argv, VALUE klass)
{
    VALUE str, opt;

    rb_scan_args(argc, argv, "1:", &str, &opt);
    check_limit(str, opt);

    return date__iso8601(str);
}

Returns a hash of values parsed from string, which should contain an ISO 8601 formatted date:

d = Date.new(2001, 2, 3)
s = d.iso8601    # => "2001-02-03"
Date._iso8601(s) # => {:mday=>3, :year=>2001, :mon=>2}

See argument limit.

Related: Date.iso8601 (returns a Date object).

Date._jisx0301(string, limit: 128) → hash

ext/date/date_core.c View on GitHub

          
            static VALUE
date_s__jisx0301(int argc, VALUE *argv, VALUE klass)
{
    VALUE str, opt;

    rb_scan_args(argc, argv, "1:", &str, &opt);
    check_limit(str, opt);

    return date__jisx0301(str);
}

Returns a hash of values parsed from string, which should be a valid JIS X 0301 date format:

d = Date.new(2001, 2, 3)
s = d.jisx0301    # => "H13.02.03"
Date._jisx0301(s) # => {:year=>2001, :mon=>2, :mday=>3}

See argument limit.

Related: Date.jisx0301 (returns a Date object).

Date._parse(string, comp = true, limit: 128) → hash

ext/date/date_core.c View on GitHub

          
            static VALUE
date_s__parse(int argc, VALUE *argv, VALUE klass)
{
    return date_s__parse_internal(argc, argv, klass);
}

Note: This method recognizes many forms in string, but it is not a validator. For formats, see “Specialized Format Strings” in Formats for Dates and Times

If string does not specify a valid date, the result is unpredictable; consider using Date._strptime instead.

Returns a hash of values parsed from string:

Date._parse('2001-02-03') # => {:year=>2001, :mon=>2, :mday=>3}

If comp is true and the given year is in the range (0..99), the current century is supplied; otherwise, the year is taken as given:

Date._parse('01-02-03', true)  # => {:year=>2001, :mon=>2, :mday=>3}
Date._parse('01-02-03', false) # => {:year=>1, :mon=>2, :mday=>3}

See argument limit.

Related: Date.parse(returns a Date object).

Date._rfc2822(string, limit: 128) → hash

ext/date/date_core.c View on GitHub

          
            static VALUE
date_s__rfc2822(int argc, VALUE *argv, VALUE klass)
{
    VALUE str, opt;

    rb_scan_args(argc, argv, "1:", &str, &opt);
    check_limit(str, opt);

    return date__rfc2822(str);
}

Returns a hash of values parsed from string, which should be a valid RFC 2822 date format:

d = Date.new(2001, 2, 3)
s = d.rfc2822 # => "Sat, 3 Feb 2001 00:00:00 +0000"
Date._rfc2822(s)
# => {:wday=>6, :mday=>3, :mon=>2, :year=>2001, :hour=>0, :min=>0, :sec=>0, :zone=>"+0000", :offset=>0}

See argument limit.

Date._rfc822 is an alias for Date._rfc2822.

Related: Date.rfc2822 (returns a Date object).

Date._rfc3339(string, limit: 128) → hash

ext/date/date_core.c View on GitHub

          
            static VALUE
date_s__rfc3339(int argc, VALUE *argv, VALUE klass)
{
    VALUE str, opt;

    rb_scan_args(argc, argv, "1:", &str, &opt);
    check_limit(str, opt);

    return date__rfc3339(str);
}

Returns a hash of values parsed from string, which should be a valid RFC 3339 format:

d = Date.new(2001, 2, 3)
s = d.rfc3339     # => "2001-02-03T00:00:00+00:00"
Date._rfc3339(s)
# => {:year=>2001, :mon=>2, :mday=>3, :hour=>0, :min=>0, :sec=>0, :zone=>"+00:00", :offset=>0}

See argument limit.

Related: Date.rfc3339 (returns a Date object).

Date._rfc2822(string, limit: 128) → hash

ext/date/date_core.c View on GitHub

          
            static VALUE
date_s__rfc2822(int argc, VALUE *argv, VALUE klass)
{
    VALUE str, opt;

    rb_scan_args(argc, argv, "1:", &str, &opt);
    check_limit(str, opt);

    return date__rfc2822(str);
}

Returns a hash of values parsed from string, which should be a valid RFC 2822 date format:

d = Date.new(2001, 2, 3)
s = d.rfc2822 # => "Sat, 3 Feb 2001 00:00:00 +0000"
Date._rfc2822(s)
# => {:wday=>6, :mday=>3, :mon=>2, :year=>2001, :hour=>0, :min=>0, :sec=>0, :zone=>"+0000", :offset=>0}

See argument limit.

Date._rfc822 is an alias for Date._rfc2822.

Related: Date.rfc2822 (returns a Date object).

Date._strptime(string, format = '%F') → hash

ext/date/date_core.c View on GitHub

          
            static VALUE
date_s__strptime(int argc, VALUE *argv, VALUE klass)
{
    return date_s__strptime_internal(argc, argv, klass, "%F");
}

Returns a hash of values parsed from string according to the given format:

Date._strptime('2001-02-03', '%Y-%m-%d') # => {:year=>2001, :mon=>2, :mday=>3}

For other formats, see Formats for Dates and Times. (Unlike Date.strftime, does not support flags and width.)

Date._xmlschema(string, limit: 128) → hash

ext/date/date_core.c View on GitHub

          
            static VALUE
date_s__xmlschema(int argc, VALUE *argv, VALUE klass)
{
    VALUE str, opt;

    rb_scan_args(argc, argv, "1:", &str, &opt);
    check_limit(str, opt);

    return date__xmlschema(str);
}

Returns a hash of values parsed from string, which should be a valid XML date format:

d = Date.new(2001, 2, 3)
s = d.xmlschema    # => "2001-02-03"
Date._xmlschema(s) # => {:year=>2001, :mon=>2, :mday=>3}

See argument limit.

Related: Date.xmlschema (returns a Date object).

Date.commercial(cwyear = -4712, cweek = 1, cwday = 1, start = Date::ITALY) → date

ext/date/date_core.c View on GitHub

          
            static VALUE
date_s_commercial(int argc, VALUE *argv, VALUE klass)
{
    VALUE vy, vw, vd, vsg, y, fr, fr2, ret;
    int w, d;
    double sg;

    rb_scan_args(argc, argv, "04", &vy, &vw, &vd, &vsg);

    y = INT2FIX(-4712);
    w = 1;
    d = 1;
    fr2 = INT2FIX(0);
    sg = DEFAULT_SG;

    switch (argc) {
      case 4:
        val2sg(vsg, sg);
      case 3:
        check_numeric(vd, "cwday");
        num2int_with_frac(d, positive_inf);
      case 2:
        check_numeric(vw, "cweek");
        w = NUM2INT(vw);
      case 1:
        check_numeric(vy, "year");
        y = vy;
    }

    {
        VALUE nth;
        int ry, rw, rd, rjd, ns;

        if (!valid_commercial_p(y, w, d, sg,
                                &nth, &ry,
                                &rw, &rd, &rjd,
                                &ns))
            rb_raise(eDateError, "invalid date");

        ret = d_simple_new_internal(klass,
                                    nth, rjd,
                                    sg,
                                    0, 0, 0,
                                    HAVE_JD);
    }
    add_frac();
    return ret;
}

Returns a new Date object constructed from the arguments.

Argument cwyear gives the year, and should be an integer.

Argument cweek gives the index of the week within the year, and should be in range (1..53) or (-53..-1); in some years, 53 or -53 will be out-of-range; if negative, counts backward from the end of the year:

Date.commercial(2022, 1, 1).to_s  # => "2022-01-03"
Date.commercial(2022, 52, 1).to_s # => "2022-12-26"

Argument cwday gives the indes of the weekday within the week, and should be in range (1..7) or (-7..-1); 1 or -7 is Monday; if negative, counts backward from the end of the week:

Date.commercial(2022, 1, 1).to_s  # => "2022-01-03"
Date.commercial(2022, 1, -7).to_s # => "2022-01-03"

When cweek is 1:

If January 1 is a Friday, Saturday, or Sunday, the first week begins in the week after:

Date::ABBR_DAYNAMES[Date.new(2023, 1, 1).wday] # => "Sun"
Date.commercial(2023, 1, 1).to_s # => "2023-01-02"
Date.commercial(2023, 1, 7).to_s # => "2023-01-08"

Otherwise, the first week is the week of January 1, which may mean some of the days fall on the year before:

Date::ABBR_DAYNAMES[Date.new(2020, 1, 1).wday] # => "Wed"
Date.commercial(2020, 1, 1).to_s # => "2019-12-30"
Date.commercial(2020, 1, 7).to_s # => "2020-01-05"

See argument start.

Date.gregorian_leap?(year) → true or false

ext/date/date_core.c View on GitHub

          
            static VALUE
date_s_gregorian_leap_p(VALUE klass, VALUE y)
{
    VALUE nth;
    int ry;

    check_numeric(y, "year");
    decode_year(y, -1, &nth, &ry);
    return f_boolcast(c_gregorian_leap_p(ry));
}

Returns true if the given year is a leap year in the proleptic Gregorian calendar, false otherwise:

Date.gregorian_leap?(2000) # => true
Date.gregorian_leap?(2001) # => false

Date.leap? is an alias for Date.gregorian_leap?.

Related: Date.julian_leap?.

Date.httpdate(string = 'Mon, 01 Jan -4712 00:00:00 GMT', start = Date::ITALY, limit: 128) → date

ext/date/date_core.c View on GitHub

          
            static VALUE
date_s_httpdate(int argc, VALUE *argv, VALUE klass)
{
    VALUE str, sg, opt;

    rb_scan_args(argc, argv, "02:", &str, &sg, &opt);

    switch (argc) {
      case 0:
        str = rb_str_new2("Mon, 01 Jan -4712 00:00:00 GMT");
      case 1:
        sg = INT2FIX(DEFAULT_SG);
    }

    {
        int argc2 = 1;
        VALUE argv2[2], hash;
        argv2[0] = str;
        if (!NIL_P(opt)) argv2[argc2++] = opt;
        hash = date_s__httpdate(argc2, argv2, klass);
        return d_new_by_frags(klass, hash, sg);
    }
}

Returns a new Date object with values parsed from string, which should be a valid HTTP date format:

d = Date.new(2001, 2, 3)
s = d.httpdate   # => "Sat, 03 Feb 2001 00:00:00 GMT"
Date.httpdate(s) # => #<Date: 2001-02-03>

See:

Argument start.
Argument limit.

Related: Date._httpdate (returns a hash).

Date.iso8601(string = '-4712-01-01', start = Date::ITALY, limit: 128) → date

ext/date/date_core.c View on GitHub

          
            static VALUE
date_s_iso8601(int argc, VALUE *argv, VALUE klass)
{
    VALUE str, sg, opt;

    rb_scan_args(argc, argv, "02:", &str, &sg, &opt);
    if (!NIL_P(opt)) argc--;

    switch (argc) {
      case 0:
        str = rb_str_new2("-4712-01-01");
      case 1:
        sg = INT2FIX(DEFAULT_SG);
    }

    {
        int argc2 = 1;
        VALUE argv2[2], hash;
        argv2[0] = str;
        if (!NIL_P(opt)) argv2[argc2++] = opt;
        hash = date_s__iso8601(argc2, argv2, klass);
        return d_new_by_frags(klass, hash, sg);
    }
}

Returns a new Date object with values parsed from string, which should contain an ISO 8601 formatted date:

d = Date.new(2001, 2, 3)
s = d.iso8601   # => "2001-02-03"
Date.iso8601(s) # => #<Date: 2001-02-03>

See:

Argument start.
Argument limit.

Related: Date._iso8601 (returns a hash).

Date.jd(jd = 0, start = Date::ITALY) → date

ext/date/date_core.c View on GitHub

          
            static VALUE
date_s_jd(int argc, VALUE *argv, VALUE klass)
{
    VALUE vjd, vsg, jd, fr, fr2, ret;
    double sg;

    rb_scan_args(argc, argv, "02", &vjd, &vsg);

    jd = INT2FIX(0);
    fr2 = INT2FIX(0);
    sg = DEFAULT_SG;

    switch (argc) {
      case 2:
        val2sg(vsg, sg);
      case 1:
        check_numeric(vjd, "jd");
        num2num_with_frac(jd, positive_inf);
    }

    {
        VALUE nth;
        int rjd;

        decode_jd(jd, &nth, &rjd);
        ret = d_simple_new_internal(klass,
                                    nth, rjd,
                                    sg,
                                    0, 0, 0,
                                    HAVE_JD);
    }
    add_frac();
    return ret;
}

Returns a new Date object formed from the arguments:

Date.jd(2451944).to_s # => "2001-02-03"
Date.jd(2451945).to_s # => "2001-02-04"
Date.jd(0).to_s       # => "-4712-01-01"

The returned date is:

Gregorian, if the argument is greater than or equal to start:

Date::ITALY                         # => 2299161
Date.jd(Date::ITALY).gregorian?     # => true
Date.jd(Date::ITALY + 1).gregorian? # => true

Julian, otherwise

Date.jd(Date::ITALY - 1).julian?    # => true

See argument start.

Related: Date.new.

Date.jisx0301(string = '-4712-01-01', start = Date::ITALY, limit: 128) → date

ext/date/date_core.c View on GitHub

          
            static VALUE
date_s_jisx0301(int argc, VALUE *argv, VALUE klass)
{
    VALUE str, sg, opt;

    rb_scan_args(argc, argv, "02:", &str, &sg, &opt);
    if (!NIL_P(opt)) argc--;

    switch (argc) {
      case 0:
        str = rb_str_new2("-4712-01-01");
      case 1:
        sg = INT2FIX(DEFAULT_SG);
    }

    {
        int argc2 = 1;
        VALUE argv2[2], hash;
        argv2[0] = str;
        if (!NIL_P(opt)) argv2[argc2++] = opt;
        hash = date_s__jisx0301(argc2, argv2, klass);
        return d_new_by_frags(klass, hash, sg);
    }
}

Returns a new Date object with values parsed from string, which should be a valid JIS X 0301 format:

d = Date.new(2001, 2, 3)
s = d.jisx0301   # => "H13.02.03"
Date.jisx0301(s) # => #<Date: 2001-02-03>

For no-era year, legacy format, Heisei is assumed.

Date.jisx0301('13.02.03') # => #<Date: 2001-02-03>

See:

Argument start.
Argument limit.

Related: Date._jisx0301 (returns a hash).

json_create(object)

ext/json/lib/json/add/date.rb View on GitHub

          
            # File tmp/rubies/ruby-3.2.0/ext/json/lib/json/add/date.rb, line 11
def self.json_create(object)
  civil(*object.values_at('y', 'm', 'd', 'sg'))
end

Deserializes JSON string by converting Julian year y, month m, day d and Day of Calendar Reform sg to Date.

Date.julian_leap?(year) → true or false

ext/date/date_core.c View on GitHub

          
            static VALUE
date_s_julian_leap_p(VALUE klass, VALUE y)
{
    VALUE nth;
    int ry;

    check_numeric(y, "year");
    decode_year(y, +1, &nth, &ry);
    return f_boolcast(c_julian_leap_p(ry));
}

Returns true if the given year is a leap year in the proleptic Julian calendar, false otherwise:

Date.julian_leap?(1900) # => true
Date.julian_leap?(1901) # => false

Related: Date.gregorian_leap?.

Date.gregorian_leap?(year) → true or false

ext/date/date_core.c View on GitHub

          
            static VALUE
date_s_gregorian_leap_p(VALUE klass, VALUE y)
{
    VALUE nth;
    int ry;

    check_numeric(y, "year");
    decode_year(y, -1, &nth, &ry);
    return f_boolcast(c_gregorian_leap_p(ry));
}

Returns true if the given year is a leap year in the proleptic Gregorian calendar, false otherwise:

Date.gregorian_leap?(2000) # => true
Date.gregorian_leap?(2001) # => false

Date.leap? is an alias for Date.gregorian_leap?.

Related: Date.julian_leap?.

Date.new(year = -4712, month = 1, mday = 1, start = Date::ITALY) → date

ext/date/date_core.c View on GitHub

          
            static VALUE
date_initialize(int argc, VALUE *argv, VALUE self)
{
    VALUE vy, vm, vd, vsg, y, fr, fr2, ret;
    int m, d;
    double sg;
    struct SimpleDateData *dat = rb_check_typeddata(self, &d_lite_type);

    if (!simple_dat_p(dat)) {
        rb_raise(rb_eTypeError, "Date expected");
    }

    rb_scan_args(argc, argv, "04", &vy, &vm, &vd, &vsg);

    y = INT2FIX(-4712);
    m = 1;
    d = 1;
    fr2 = INT2FIX(0);
    sg = DEFAULT_SG;

    switch (argc) {
      case 4:
        val2sg(vsg, sg);
      case 3:
        check_numeric(vd, "day");
        num2int_with_frac(d, positive_inf);
      case 2:
        check_numeric(vm, "month");
        m = NUM2INT(vm);
      case 1:
        check_numeric(vy, "year");
        y = vy;
    }

    if (guess_style(y, sg) < 0) {
        VALUE nth;
        int ry, rm, rd;

        if (!valid_gregorian_p(y, m, d,
                               &nth, &ry,
                               &rm, &rd))
            rb_raise(eDateError, "invalid date");

        set_to_simple(self, dat, nth, 0, sg, ry, rm, rd, HAVE_CIVIL);
    }
    else {
        VALUE nth;
        int ry, rm, rd, rjd, ns;

        if (!valid_civil_p(y, m, d, sg,
                           &nth, &ry,
                           &rm, &rd, &rjd,
                           &ns))
            rb_raise(eDateError, "invalid date");

        set_to_simple(self, dat, nth, rjd, sg, ry, rm, rd, HAVE_JD | HAVE_CIVIL);
    }
    ret = self;
    add_frac();
    return ret;
}

Returns a new Date object constructed from the given arguments:

Date.new(2022).to_s        # => "2022-01-01"
Date.new(2022, 2).to_s     # => "2022-02-01"
Date.new(2022, 2, 4).to_s  # => "2022-02-04"

Argument month should be in range (1..12) or range (-12..-1); when the argument is negative, counts backward from the end of the year:

Date.new(2022, -11, 4).to_s # => "2022-02-04"

Argument mday should be in range (1..n) or range (-n..-1) where n is the number of days in the month; when the argument is negative, counts backward from the end of the month.

See argument start.

Date.civil is an alias for Date.new.

Related: Date.jd.

Date.ordinal(year = -4712, yday = 1, start = Date::ITALY) → date

ext/date/date_core.c View on GitHub

          
            static VALUE
date_s_ordinal(int argc, VALUE *argv, VALUE klass)
{
    VALUE vy, vd, vsg, y, fr, fr2, ret;
    int d;
    double sg;

    rb_scan_args(argc, argv, "03", &vy, &vd, &vsg);

    y = INT2FIX(-4712);
    d = 1;
    fr2 = INT2FIX(0);
    sg = DEFAULT_SG;

    switch (argc) {
      case 3:
        val2sg(vsg, sg);
      case 2:
        check_numeric(vd, "yday");
        num2int_with_frac(d, positive_inf);
      case 1:
        check_numeric(vy, "year");
        y = vy;
    }

    {
        VALUE nth;
        int ry, rd, rjd, ns;

        if (!valid_ordinal_p(y, d, sg,
                             &nth, &ry,
                             &rd, &rjd,
                             &ns))
            rb_raise(eDateError, "invalid date");

        ret = d_simple_new_internal(klass,
                                     nth, rjd,
                                     sg,
                                     0, 0, 0,
                                     HAVE_JD);
    }
    add_frac();
    return ret;
}

Returns a new Date object formed fom the arguments.

With no arguments, returns the date for January 1, -4712:

Date.ordinal.to_s # => "-4712-01-01"

With argument year, returns the date for January 1 of that year:

Date.ordinal(2001).to_s  # => "2001-01-01"
Date.ordinal(-2001).to_s # => "-2001-01-01"

With positive argument yday == n, returns the date for the nth day of the given year:

Date.ordinal(2001, 14).to_s # => "2001-01-14"

With negative argument yday, counts backward from the end of the year:

Date.ordinal(2001, -14).to_s # => "2001-12-18"

Raises an exception if yday is zero or out of range.

See argument start.

Related: Date.jd, Date.new.

Date.parse(string = '-4712-01-01', comp = true, start = Date::ITALY, limit: 128) → date

ext/date/date_core.c View on GitHub

          
            static VALUE
date_s_parse(int argc, VALUE *argv, VALUE klass)
{
    VALUE str, comp, sg, opt;

    rb_scan_args(argc, argv, "03:", &str, &comp, &sg, &opt);
    if (!NIL_P(opt)) argc--;

    switch (argc) {
      case 0:
        str = rb_str_new2("-4712-01-01");
      case 1:
        comp = Qtrue;
      case 2:
        sg = INT2FIX(DEFAULT_SG);
    }

    {
        int argc2 = 2;
        VALUE argv2[3], hash;
        argv2[0] = str;
        argv2[1] = comp;
        if (!NIL_P(opt)) argv2[argc2++] = opt;
        hash = date_s__parse(argc2, argv2, klass);
        return d_new_by_frags(klass, hash, sg);
    }
}

Note: This method recognizes many forms in string, but it is not a validator. For formats, see “Specialized Format Strings” in Formats for Dates and Times If string does not specify a valid date, the result is unpredictable; consider using Date._strptime instead.

Returns a new Date object with values parsed from string:

Date.parse('2001-02-03')   # => #<Date: 2001-02-03>
Date.parse('20010203')     # => #<Date: 2001-02-03>
Date.parse('3rd Feb 2001') # => #<Date: 2001-02-03>

If comp is true and the given year is in the range (0..99), the current century is supplied; otherwise, the year is taken as given:

Date.parse('01-02-03', true)  # => #<Date: 2001-02-03>
Date.parse('01-02-03', false) # => #<Date: 0001-02-03>

See:

Argument start.
Argument limit.

Related: Date._parse (returns a hash).

Date.rfc2822(string = 'Mon, 1 Jan -4712 00:00:00 +0000', start = Date::ITALY, limit: 128) → date

ext/date/date_core.c View on GitHub

          
            static VALUE
date_s_rfc2822(int argc, VALUE *argv, VALUE klass)
{
    VALUE str, sg, opt;

    rb_scan_args(argc, argv, "02:", &str, &sg, &opt);

    switch (argc) {
      case 0:
        str = rb_str_new2("Mon, 1 Jan -4712 00:00:00 +0000");
      case 1:
        sg = INT2FIX(DEFAULT_SG);
    }

    {
        int argc2 = 1;
        VALUE argv2[2], hash;
        argv2[0] = str;
        if (!NIL_P(opt)) argv2[argc2++] = opt;
        hash = date_s__rfc2822(argc2, argv2, klass);
        return d_new_by_frags(klass, hash, sg);
    }
}

Returns a new Date object with values parsed from string, which should be a valid RFC 2822 date format:

d = Date.new(2001, 2, 3)
s = d.rfc2822   # => "Sat, 3 Feb 2001 00:00:00 +0000"
Date.rfc2822(s) # => #<Date: 2001-02-03>

See:

Argument start.
Argument limit.

Date.rfc822 is an alias for Date.rfc2822.

Related: Date._rfc2822 (returns a hash).

Date.rfc3339(string = '-4712-01-01T00:00:00+00:00', start = Date::ITALY, limit: 128) → date

ext/date/date_core.c View on GitHub

          
            static VALUE
date_s_rfc3339(int argc, VALUE *argv, VALUE klass)
{
    VALUE str, sg, opt;

    rb_scan_args(argc, argv, "02:", &str, &sg, &opt);
    if (!NIL_P(opt)) argc--;

    switch (argc) {
      case 0:
        str = rb_str_new2("-4712-01-01T00:00:00+00:00");
      case 1:
        sg = INT2FIX(DEFAULT_SG);
    }

    {
        int argc2 = 1;
        VALUE argv2[2], hash;
        argv2[0] = str;
        if (!NIL_P(opt)) argv2[argc2++] = opt;
        hash = date_s__rfc3339(argc2, argv2, klass);
        return d_new_by_frags(klass, hash, sg);
    }
}

Returns a new Date object with values parsed from string, which should be a valid RFC 3339 format:

d = Date.new(2001, 2, 3)
s = d.rfc3339   # => "2001-02-03T00:00:00+00:00"
Date.rfc3339(s) # => #<Date: 2001-02-03>

See:

Argument start.
Argument limit.

Related: Date._rfc3339 (returns a hash).

Date.rfc2822(string = 'Mon, 1 Jan -4712 00:00:00 +0000', start = Date::ITALY, limit: 128) → date

ext/date/date_core.c View on GitHub

          
            static VALUE
date_s_rfc2822(int argc, VALUE *argv, VALUE klass)
{
    VALUE str, sg, opt;

    rb_scan_args(argc, argv, "02:", &str, &sg, &opt);

    switch (argc) {
      case 0:
        str = rb_str_new2("Mon, 1 Jan -4712 00:00:00 +0000");
      case 1:
        sg = INT2FIX(DEFAULT_SG);
    }

    {
        int argc2 = 1;
        VALUE argv2[2], hash;
        argv2[0] = str;
        if (!NIL_P(opt)) argv2[argc2++] = opt;
        hash = date_s__rfc2822(argc2, argv2, klass);
        return d_new_by_frags(klass, hash, sg);
    }
}

Returns a new Date object with values parsed from string, which should be a valid RFC 2822 date format:

d = Date.new(2001, 2, 3)
s = d.rfc2822   # => "Sat, 3 Feb 2001 00:00:00 +0000"
Date.rfc2822(s) # => #<Date: 2001-02-03>

See:

Argument start.
Argument limit.

Date.rfc822 is an alias for Date.rfc2822.

Related: Date._rfc2822 (returns a hash).

Date.strptime(string = '-4712-01-01', format = '%F', start = Date::ITALY) → date

ext/date/date_core.c View on GitHub

          
            static VALUE
date_s_strptime(int argc, VALUE *argv, VALUE klass)
{
    VALUE str, fmt, sg;

    rb_scan_args(argc, argv, "03", &str, &fmt, &sg);

    switch (argc) {
      case 0:
        str = rb_str_new2("-4712-01-01");
      case 1:
        fmt = rb_str_new2("%F");
      case 2:
        sg = INT2FIX(DEFAULT_SG);
    }

    {
        VALUE argv2[2], hash;

        argv2[0] = str;
        argv2[1] = fmt;
        hash = date_s__strptime(2, argv2, klass);
        return d_new_by_frags(klass, hash, sg);
    }
}

Returns a new Date object with values parsed from string, according to the given format:

Date.strptime('2001-02-03', '%Y-%m-%d')  # => #<Date: 2001-02-03>
Date.strptime('03-02-2001', '%d-%m-%Y')  # => #<Date: 2001-02-03>
Date.strptime('2001-034', '%Y-%j')       # => #<Date: 2001-02-03>
Date.strptime('2001-W05-6', '%G-W%V-%u') # => #<Date: 2001-02-03>
Date.strptime('2001 04 6', '%Y %U %w')   # => #<Date: 2001-02-03>
Date.strptime('2001 05 6', '%Y %W %u')   # => #<Date: 2001-02-03>
Date.strptime('sat3feb01', '%a%d%b%y')   # => #<Date: 2001-02-03>

For other formats, see Formats for Dates and Times. (Unlike Date.strftime, does not support flags and width.)

See argument start.

Date.today(start = Date::ITALY) → date

ext/date/date_core.c View on GitHub

          
            static VALUE
date_s_today(int argc, VALUE *argv, VALUE klass)
{
    VALUE vsg, nth, ret;
    double sg;
    time_t t;
    struct tm tm;
    int y, ry, m, d;

    rb_scan_args(argc, argv, "01", &vsg);

    if (argc < 1)
        sg = DEFAULT_SG;
    else
        val2sg(vsg, sg);

    if (time(&t) == -1)
        rb_sys_fail("time");
    tzset();
    if (!localtime_r(&t, &tm))
        rb_sys_fail("localtime");

    y = tm.tm_year + 1900;
    m = tm.tm_mon + 1;
    d = tm.tm_mday;

    decode_year(INT2FIX(y), -1, &nth, &ry);

    ret = d_simple_new_internal(klass,
                                nth, 0,
                                GREGORIAN,
                                ry, m, d,
                                HAVE_CIVIL);
    {
        get_d1(ret);
        set_sg(dat, sg);
    }
    return ret;
}

Returns a new Date object constructed from the present date:

Date.today.to_s # => "2022-07-06"

See argument start.

Date.valid_civil?(year, month, mday, start = Date::ITALY) → true or false

ext/date/date_core.c View on GitHub

          
            static VALUE
date_s_valid_civil_p(int argc, VALUE *argv, VALUE klass)
{
    VALUE vy, vm, vd, vsg;
    VALUE argv2[4];

    rb_scan_args(argc, argv, "31", &vy, &vm, &vd, &vsg);

    RETURN_FALSE_UNLESS_NUMERIC(vy);
    RETURN_FALSE_UNLESS_NUMERIC(vm);
    RETURN_FALSE_UNLESS_NUMERIC(vd);
    argv2[0] = vy;
    argv2[1] = vm;
    argv2[2] = vd;
    if (argc < 4)
        argv2[3] = INT2FIX(DEFAULT_SG);
    else
        argv2[3] = vsg;

    if (NIL_P(valid_civil_sub(4, argv2, klass, 0)))
        return Qfalse;
    return Qtrue;
}

Returns true if the arguments define a valid ordinal date, false otherwise:

Date.valid_date?(2001, 2, 3)  # => true
Date.valid_date?(2001, 2, 29) # => false
Date.valid_date?(2001, 2, -1) # => true

See argument start.

Date.valid_date? is an alias for Date.valid_civil?.

Related: Date.jd, Date.new.

Date.valid_commercial?(cwyear, cweek, cwday, start = Date::ITALY) → true or false

ext/date/date_core.c View on GitHub

          
            static VALUE
date_s_valid_commercial_p(int argc, VALUE *argv, VALUE klass)
{
    VALUE vy, vw, vd, vsg;
    VALUE argv2[4];

    rb_scan_args(argc, argv, "31", &vy, &vw, &vd, &vsg);

    RETURN_FALSE_UNLESS_NUMERIC(vy);
    RETURN_FALSE_UNLESS_NUMERIC(vw);
    RETURN_FALSE_UNLESS_NUMERIC(vd);
    argv2[0] = vy;
    argv2[1] = vw;
    argv2[2] = vd;
    if (argc < 4)
        argv2[3] = INT2FIX(DEFAULT_SG);
    else
        argv2[3] = vsg;

    if (NIL_P(valid_commercial_sub(4, argv2, klass, 0)))
        return Qfalse;
    return Qtrue;
}

Returns true if the arguments define a valid commercial date, false otherwise:

Date.valid_commercial?(2001, 5, 6) # => true
Date.valid_commercial?(2001, 5, 8) # => false

See Date.commercial.

See argument start.

Related: Date.jd, Date.commercial.

Date.valid_civil?(year, month, mday, start = Date::ITALY) → true or false

ext/date/date_core.c View on GitHub

          
            static VALUE
date_s_valid_civil_p(int argc, VALUE *argv, VALUE klass)
{
    VALUE vy, vm, vd, vsg;
    VALUE argv2[4];

    rb_scan_args(argc, argv, "31", &vy, &vm, &vd, &vsg);

    RETURN_FALSE_UNLESS_NUMERIC(vy);
    RETURN_FALSE_UNLESS_NUMERIC(vm);
    RETURN_FALSE_UNLESS_NUMERIC(vd);
    argv2[0] = vy;
    argv2[1] = vm;
    argv2[2] = vd;
    if (argc < 4)
        argv2[3] = INT2FIX(DEFAULT_SG);
    else
        argv2[3] = vsg;

    if (NIL_P(valid_civil_sub(4, argv2, klass, 0)))
        return Qfalse;
    return Qtrue;
}

Returns true if the arguments define a valid ordinal date, false otherwise:

Date.valid_date?(2001, 2, 3)  # => true
Date.valid_date?(2001, 2, 29) # => false
Date.valid_date?(2001, 2, -1) # => true

See argument start.

Date.valid_date? is an alias for Date.valid_civil?.

Related: Date.jd, Date.new.

Date.valid_jd?(jd, start = Date::ITALY) → true

ext/date/date_core.c View on GitHub

          
            static VALUE
date_s_valid_jd_p(int argc, VALUE *argv, VALUE klass)
{
    VALUE vjd, vsg;
    VALUE argv2[2];

    rb_scan_args(argc, argv, "11", &vjd, &vsg);

    RETURN_FALSE_UNLESS_NUMERIC(vjd);
    argv2[0] = vjd;
    if (argc < 2)
        argv2[1] = INT2FIX(DEFAULT_SG);
    else
        argv2[1] = vsg;

    if (NIL_P(valid_jd_sub(2, argv2, klass, 0)))
        return Qfalse;
    return Qtrue;
}

Implemented for compatibility; returns true unless jd is invalid (i.e., not a Numeric).

Date.valid_jd?(2451944) # => true

See argument start.

Related: Date.jd.

Date.valid_ordinal?(year, yday, start = Date::ITALY) → true or false

ext/date/date_core.c View on GitHub

          
            static VALUE
date_s_valid_ordinal_p(int argc, VALUE *argv, VALUE klass)
{
    VALUE vy, vd, vsg;
    VALUE argv2[3];

    rb_scan_args(argc, argv, "21", &vy, &vd, &vsg);

    RETURN_FALSE_UNLESS_NUMERIC(vy);
    RETURN_FALSE_UNLESS_NUMERIC(vd);
    argv2[0] = vy;
    argv2[1] = vd;
    if (argc < 3)
        argv2[2] = INT2FIX(DEFAULT_SG);
    else
        argv2[2] = vsg;

    if (NIL_P(valid_ordinal_sub(3, argv2, klass, 0)))
        return Qfalse;
    return Qtrue;
}

Returns true if the arguments define a valid ordinal date, false otherwise:

Date.valid_ordinal?(2001, 34)  # => true
Date.valid_ordinal?(2001, 366) # => false

See argument start.

Related: Date.jd, Date.ordinal.

Date.xmlschema(string = '-4712-01-01', start = Date::ITALY, limit: 128) → date

ext/date/date_core.c View on GitHub

          
            static VALUE
date_s_xmlschema(int argc, VALUE *argv, VALUE klass)
{
    VALUE str, sg, opt;

    rb_scan_args(argc, argv, "02:", &str, &sg, &opt);
    if (!NIL_P(opt)) argc--;

    switch (argc) {
      case 0:
        str = rb_str_new2("-4712-01-01");
      case 1:
        sg = INT2FIX(DEFAULT_SG);
    }

    {
        int argc2 = 1;
        VALUE argv2[2], hash;
        argv2[0] = str;
        if (!NIL_P(opt)) argv2[argc2++] = opt;
        hash = date_s__xmlschema(argc2, argv2, klass);
        return d_new_by_frags(klass, hash, sg);
    }
}

Returns a new Date object with values parsed from string, which should be a valid XML date format:

d = Date.new(2001, 2, 3)
s = d.xmlschema   # => "2001-02-03"
Date.xmlschema(s) # => #<Date: 2001-02-03>

See:

Argument start.
Argument limit.

Related: Date._xmlschema (returns a hash).

Instance Methods

d + other → date

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_plus(VALUE self, VALUE other)
{
    int try_rational = 1;
    get_d1(self);

  again:
    switch (TYPE(other)) {
      case T_FIXNUM:
        {
            VALUE nth;
            long t;
            int jd;

            nth = m_nth(dat);
            t = FIX2LONG(other);
            if (DIV(t, CM_PERIOD)) {
                nth = f_add(nth, INT2FIX(DIV(t, CM_PERIOD)));
                t = MOD(t, CM_PERIOD);
            }

            if (!t)
                jd = m_jd(dat);
            else {
                jd = m_jd(dat) + (int)t;
                canonicalize_jd(nth, jd);
            }

            if (simple_dat_p(dat))
                return d_simple_new_internal(rb_obj_class(self),
                                             nth, jd,
                                             dat->s.sg,
                                             0, 0, 0,
                                             (dat->s.flags | HAVE_JD) &
                                             ~HAVE_CIVIL);
            else
                return d_complex_new_internal(rb_obj_class(self),
                                              nth, jd,
                                              dat->c.df, dat->c.sf,
                                              dat->c.of, dat->c.sg,
                                              0, 0, 0,
#ifndef USE_PACK
                                              dat->c.hour,
                                              dat->c.min,
                                              dat->c.sec,
#else
                                              EX_HOUR(dat->c.pc),
                                              EX_MIN(dat->c.pc),
                                              EX_SEC(dat->c.pc),
#endif
                                              (dat->c.flags | HAVE_JD) &
                                              ~HAVE_CIVIL);
        }
        break;
      case T_BIGNUM:
        {
            VALUE nth;
            int jd, s;

            if (f_positive_p(other))
                s = +1;
            else {
                s = -1;
                other = f_negate(other);
            }

            nth = f_idiv(other, INT2FIX(CM_PERIOD));
            jd = FIX2INT(f_mod(other, INT2FIX(CM_PERIOD)));

            if (s < 0) {
                nth = f_negate(nth);
                jd = -jd;
            }

            if (!jd)
                jd = m_jd(dat);
            else {
                jd = m_jd(dat) + jd;
                canonicalize_jd(nth, jd);
            }

            if (f_zero_p(nth))
                nth = m_nth(dat);
            else
                nth = f_add(m_nth(dat), nth);

            if (simple_dat_p(dat))
                return d_simple_new_internal(rb_obj_class(self),
                                             nth, jd,
                                             dat->s.sg,
                                             0, 0, 0,
                                             (dat->s.flags | HAVE_JD) &
                                             ~HAVE_CIVIL);
            else
                return d_complex_new_internal(rb_obj_class(self),
                                              nth, jd,
                                              dat->c.df, dat->c.sf,
                                              dat->c.of, dat->c.sg,
                                              0, 0, 0,
#ifndef USE_PACK
                                              dat->c.hour,
                                              dat->c.min,
                                              dat->c.sec,
#else
                                              EX_HOUR(dat->c.pc),
                                              EX_MIN(dat->c.pc),
                                              EX_SEC(dat->c.pc),
#endif
                                              (dat->c.flags | HAVE_JD) &
                                              ~HAVE_CIVIL);
        }
        break;
      case T_FLOAT:
        {
            double jd, o, tmp;
            int s, df;
            VALUE nth, sf;

            o = RFLOAT_VALUE(other);

            if (o > 0)
                s = +1;
            else {
                s = -1;
                o = -o;
            }

            o = modf(o, &tmp);

            if (!floor(tmp / CM_PERIOD)) {
                nth = INT2FIX(0);
                jd = (int)tmp;
            }
            else {
                double i, f;

                f = modf(tmp / CM_PERIOD, &i);
                nth = f_floor(DBL2NUM(i));
                jd = (int)(f * CM_PERIOD);
            }

            o *= DAY_IN_SECONDS;
            o = modf(o, &tmp);
            df = (int)tmp;
            o *= SECOND_IN_NANOSECONDS;
            sf = INT2FIX((int)round(o));

            if (s < 0) {
                jd = -jd;
                df = -df;
                sf = f_negate(sf);
            }

            if (f_zero_p(sf))
                sf = m_sf(dat);
            else {
                sf = f_add(m_sf(dat), sf);
                if (f_lt_p(sf, INT2FIX(0))) {
                    df -= 1;
                    sf = f_add(sf, INT2FIX(SECOND_IN_NANOSECONDS));
                }
                else if (f_ge_p(sf, INT2FIX(SECOND_IN_NANOSECONDS))) {
                    df += 1;
                    sf = f_sub(sf, INT2FIX(SECOND_IN_NANOSECONDS));
                }
            }

            if (!df)
                df = m_df(dat);
            else {
                df = m_df(dat) + df;
                if (df < 0) {
                    jd -= 1;
                    df += DAY_IN_SECONDS;
                }
                else if (df >= DAY_IN_SECONDS) {
                    jd += 1;
                    df -= DAY_IN_SECONDS;
                }
            }

            if (!jd)
                jd = m_jd(dat);
            else {
                jd = m_jd(dat) + jd;
                canonicalize_jd(nth, jd);
            }

            if (f_zero_p(nth))
                nth = m_nth(dat);
            else
                nth = f_add(m_nth(dat), nth);

            if (!df && f_zero_p(sf) && !m_of(dat))
                return d_simple_new_internal(rb_obj_class(self),
                                             nth, (int)jd,
                                             m_sg(dat),
                                             0, 0, 0,
                                             (dat->s.flags | HAVE_JD) &
                                             ~(HAVE_CIVIL | HAVE_TIME |
                                               COMPLEX_DAT));
            else
                return d_complex_new_internal(rb_obj_class(self),
                                              nth, (int)jd,
                                              df, sf,
                                              m_of(dat), m_sg(dat),
                                              0, 0, 0,
                                              0, 0, 0,
                                              (dat->c.flags |
                                               HAVE_JD | HAVE_DF) &
                                              ~(HAVE_CIVIL | HAVE_TIME));
        }
        break;
      default:
        expect_numeric(other);
        other = f_to_r(other);
        if (!k_rational_p(other)) {
            if (!try_rational) Check_Type(other, T_RATIONAL);
            try_rational = 0;
            goto again;
        }
        /* fall through */
      case T_RATIONAL:
        {
            VALUE nth, sf, t;
            int jd, df, s;

            if (wholenum_p(other)) {
                other = rb_rational_num(other);
                goto again;
            }

            if (f_positive_p(other))
                s = +1;
            else {
                s = -1;
                other = f_negate(other);
            }

            nth = f_idiv(other, INT2FIX(CM_PERIOD));
            t = f_mod(other, INT2FIX(CM_PERIOD));

            jd = FIX2INT(f_idiv(t, INT2FIX(1)));
            t = f_mod(t, INT2FIX(1));

            t = f_mul(t, INT2FIX(DAY_IN_SECONDS));
            df = FIX2INT(f_idiv(t, INT2FIX(1)));
            t = f_mod(t, INT2FIX(1));

            sf = f_mul(t, INT2FIX(SECOND_IN_NANOSECONDS));

            if (s < 0) {
                nth = f_negate(nth);
                jd = -jd;
                df = -df;
                sf = f_negate(sf);
            }

            if (f_zero_p(sf))
                sf = m_sf(dat);
            else {
                sf = f_add(m_sf(dat), sf);
                if (f_lt_p(sf, INT2FIX(0))) {
                    df -= 1;
                    sf = f_add(sf, INT2FIX(SECOND_IN_NANOSECONDS));
                }
                else if (f_ge_p(sf, INT2FIX(SECOND_IN_NANOSECONDS))) {
                    df += 1;
                    sf = f_sub(sf, INT2FIX(SECOND_IN_NANOSECONDS));
                }
            }

            if (!df)
                df = m_df(dat);
            else {
                df = m_df(dat) + df;
                if (df < 0) {
                    jd -= 1;
                    df += DAY_IN_SECONDS;
                }
                else if (df >= DAY_IN_SECONDS) {
                    jd += 1;
                    df -= DAY_IN_SECONDS;
                }
            }

            if (!jd)
                jd = m_jd(dat);
            else {
                jd = m_jd(dat) + jd;
                canonicalize_jd(nth, jd);
            }

            if (f_zero_p(nth))
                nth = m_nth(dat);
            else
                nth = f_add(m_nth(dat), nth);

            if (!df && f_zero_p(sf) && !m_of(dat))
                return d_simple_new_internal(rb_obj_class(self),
                                             nth, jd,
                                             m_sg(dat),
                                             0, 0, 0,
                                             (dat->s.flags | HAVE_JD) &
                                             ~(HAVE_CIVIL | HAVE_TIME |
                                               COMPLEX_DAT));
            else
                return d_complex_new_internal(rb_obj_class(self),
                                              nth, jd,
                                              df, sf,
                                              m_of(dat), m_sg(dat),
                                              0, 0, 0,
                                              0, 0, 0,
                                              (dat->c.flags |
                                               HAVE_JD | HAVE_DF) &
                                              ~(HAVE_CIVIL | HAVE_TIME));
        }
        break;
    }
}

Returns a date object pointing other days after self. The other should be a numeric value. If the other is a fractional number, assumes its precision is at most nanosecond.

Date.new(2001,2,3) + 1    #=> #<Date: 2001-02-04 ...>
DateTime.new(2001,2,3) + Rational(1,2)
                          #=> #<DateTime: 2001-02-03T12:00:00+00:00 ...>
DateTime.new(2001,2,3) + Rational(-1,2)
                          #=> #<DateTime: 2001-02-02T12:00:00+00:00 ...>
DateTime.jd(0,12) + DateTime.new(2001,2,3).ajd
                          #=> #<DateTime: 2001-02-03T00:00:00+00:00 ...>

d - other → date or rational

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_minus(VALUE self, VALUE other)
{
    if (k_date_p(other))
        return minus_dd(self, other);

    switch (TYPE(other)) {
      case T_FIXNUM:
        return d_lite_plus(self, LONG2NUM(-FIX2LONG(other)));
      case T_FLOAT:
        return d_lite_plus(self, DBL2NUM(-RFLOAT_VALUE(other)));
      default:
        expect_numeric(other);
        /* fall through */
      case T_BIGNUM:
      case T_RATIONAL:
        return d_lite_plus(self, f_negate(other));
    }
}

Returns the difference between the two dates if the other is a date object. If the other is a numeric value, returns a date object pointing other days before self. If the other is a fractional number, assumes its precision is at most nanosecond.

Date.new(2001,2,3) - 1   #=> #<Date: 2001-02-02 ...>
DateTime.new(2001,2,3) - Rational(1,2)
                         #=> #<DateTime: 2001-02-02T12:00:00+00:00 ...>
Date.new(2001,2,3) - Date.new(2001)
                         #=> (33/1)
DateTime.new(2001,2,3) - DateTime.new(2001,2,2,12)
                         #=> (1/2)

d << n → date

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_lshift(VALUE self, VALUE other)
{
    expect_numeric(other);
    return d_lite_rshift(self, f_negate(other));
}

Returns a new Date object representing the date n months earlier; n should be a numeric:

(Date.new(2001, 2, 3) << 1).to_s  # => "2001-01-03"
(Date.new(2001, 2, 3) << -2).to_s # => "2001-04-03"

When the same day does not exist for the new month, the last day of that month is used instead:

(Date.new(2001, 3, 31) << 1).to_s  # => "2001-02-28"
(Date.new(2001, 3, 31) << -6).to_s # => "2001-09-30"

This results in the following, possibly unexpected, behaviors:

d0 = Date.new(2001, 3, 31)
d0 << 2      # => #<Date: 2001-01-31>
d0 << 1 << 1 # => #<Date: 2001-01-28>

d0 = Date.new(2001, 3, 31)
d1 = d0 << 1  # => #<Date: 2001-02-28>
d2 = d1 << -1 # => #<Date: 2001-03-28>

self <=> other → -1, 0, 1 or nil

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_cmp(VALUE self, VALUE other)
{
    if (!k_date_p(other))
        return cmp_gen(self, other);

    {
        get_d2(self, other);

        if (!(simple_dat_p(adat) && simple_dat_p(bdat) &&
              m_gregorian_p(adat) == m_gregorian_p(bdat)))
            return cmp_dd(self, other);

        {
            VALUE a_nth, b_nth;
            int a_jd, b_jd;

            m_canonicalize_jd(self, adat);
            m_canonicalize_jd(other, bdat);
            a_nth = m_nth(adat);
            b_nth = m_nth(bdat);
            if (f_eqeq_p(a_nth, b_nth)) {
                a_jd = m_jd(adat);
                b_jd = m_jd(bdat);
                if (a_jd == b_jd) {
                    return INT2FIX(0);
                }
                else if (a_jd < b_jd) {
                    return INT2FIX(-1);
                }
                else {
                    return INT2FIX(1);
                }
            }
            else if (f_lt_p(a_nth, b_nth)) {
                return INT2FIX(-1);
            }
            else {
                return INT2FIX(1);
            }
        }
    }
}

Compares self and other, returning:

-1 if other is larger.
0 if the two are equal.
1 if other is smaller.
nil if the two are incomparable.

Argument other may be:

Another Date object:

d = Date.new(2022, 7, 27) # => #<Date: 2022-07-27 ((2459788j,0s,0n),+0s,2299161j)>
prev_date = d.prev_day    # => #<Date: 2022-07-26 ((2459787j,0s,0n),+0s,2299161j)>
next_date = d.next_day    # => #<Date: 2022-07-28 ((2459789j,0s,0n),+0s,2299161j)>
d <=> next_date           # => -1
d <=> d                   # => 0
d <=> prev_date           # => 1

A DateTime object:

d <=> DateTime.new(2022, 7, 26) # => 1
d <=> DateTime.new(2022, 7, 27) # => 0
d <=> DateTime.new(2022, 7, 28) # => -1

A numeric (compares self.ajd to other):

d <=> 2459788 # => -1
d <=> 2459787 # => 1
d <=> 2459786 # => 1
d <=> d.ajd   # => 0

Any other object:
```
d <=> Object.new # => nil
```

self === other → true, false, or nil.

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_equal(VALUE self, VALUE other)
{
    if (!k_date_p(other))
        return equal_gen(self, other);

    {
        get_d2(self, other);

        if (!(m_gregorian_p(adat) == m_gregorian_p(bdat)))
            return equal_gen(self, other);

        {
            VALUE a_nth, b_nth;
            int a_jd, b_jd;

            m_canonicalize_jd(self, adat);
            m_canonicalize_jd(other, bdat);
            a_nth = m_nth(adat);
            b_nth = m_nth(bdat);
            a_jd = m_local_jd(adat);
            b_jd = m_local_jd(bdat);
            if (f_eqeq_p(a_nth, b_nth) &&
                a_jd == b_jd)
                return Qtrue;
            return Qfalse;
        }
    }
}

Returns true if self and other represent the same date, false if not, nil if the two are not comparable.

Argument other may be:

Another Date object:

d = Date.new(2022, 7, 27) # => #<Date: 2022-07-27 ((2459788j,0s,0n),+0s,2299161j)>
prev_date = d.prev_day    # => #<Date: 2022-07-26 ((2459787j,0s,0n),+0s,2299161j)>
next_date = d.next_day    # => #<Date: 2022-07-28 ((2459789j,0s,0n),+0s,2299161j)>
d === prev_date           # => false
d === d                   # => true
d === next_date           # => false

A DateTime object:

d === DateTime.new(2022, 7, 26) # => false
d === DateTime.new(2022, 7, 27) # => true
d === DateTime.new(2022, 7, 28) # => false

A numeric (compares self.jd to other):

d === 2459788 # => true
d === 2459787 # => false
d === 2459786 # => false
d === d.jd    # => true

An object not comparable:
```
d === Object.new # => nil
```

d >> n → new_date

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_rshift(VALUE self, VALUE other)
{
    VALUE t, y, nth, rjd2;
    int m, d, rjd;
    double sg;

    get_d1(self);
    t = f_add3(f_mul(m_real_year(dat), INT2FIX(12)),
               INT2FIX(m_mon(dat) - 1),
               other);
    if (FIXNUM_P(t)) {
        long it = FIX2LONG(t);
        y = LONG2NUM(DIV(it, 12));
        it = MOD(it, 12);
        m = (int)it + 1;
    }
    else {
        y = f_idiv(t, INT2FIX(12));
        t = f_mod(t, INT2FIX(12));
        m = FIX2INT(t) + 1;
    }
    d = m_mday(dat);
    sg = m_sg(dat);

    while (1) {
        int ry, rm, rd, ns;

        if (valid_civil_p(y, m, d, sg,
                          &nth, &ry,
                          &rm, &rd, &rjd, &ns))
            break;
        if (--d < 1)
            rb_raise(eDateError, "invalid date");
    }
    encode_jd(nth, rjd, &rjd2);
    return d_lite_plus(self, f_sub(rjd2, m_real_local_jd(dat)));
}

Returns a new Date object representing the date n months later; n should be a numeric:

(Date.new(2001, 2, 3) >> 1).to_s  # => "2001-03-03"
(Date.new(2001, 2, 3) >> -2).to_s # => "2000-12-03"

When the same day does not exist for the new month, the last day of that month is used instead:

(Date.new(2001, 1, 31) >> 1).to_s  # => "2001-02-28"
(Date.new(2001, 1, 31) >> -4).to_s # => "2000-09-30"

This results in the following, possibly unexpected, behaviors:

d0 = Date.new(2001, 1, 31)
d1 = d0 >> 1 # => #<Date: 2001-02-28>
d2 = d1 >> 1 # => #<Date: 2001-03-28>

d0 = Date.new(2001, 1, 31)
d1 = d0 >> 1  # => #<Date: 2001-02-28>
d2 = d1 >> -1 # => #<Date: 2001-01-28>

d.ajd → rational

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_ajd(VALUE self)
{
    get_d1(self);
    return m_ajd(dat);
}

Returns the astronomical Julian day number. This is a fractional number, which is not adjusted by the offset.

DateTime.new(2001,2,3,4,5,6,'+7').ajd     #=> (11769328217/4800)
DateTime.new(2001,2,2,14,5,6,'-7').ajd    #=> (11769328217/4800)

d.amjd → rational

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_amjd(VALUE self)
{
    get_d1(self);
    return m_amjd(dat);
}

Returns the astronomical modified Julian day number. This is a fractional number, which is not adjusted by the offset.

DateTime.new(2001,2,3,4,5,6,'+7').amjd    #=> (249325817/4800)
DateTime.new(2001,2,2,14,5,6,'-7').amjd   #=> (249325817/4800)

as_json(*)

ext/json/lib/json/add/date.rb View on GitHub

          
            # File tmp/rubies/ruby-3.2.0/ext/json/lib/json/add/date.rb, line 19
def as_json(*)
  {
    JSON.create_id => self.class.name,
    'y' => year,
    'm' => month,
    'd' => day,
    'sg' => start,
  }
end

Returns a hash, that will be turned into a JSON object and represent this object.

asctime -> string

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_asctime(VALUE self)
{
    return strftimev("%a %b %e %H:%M:%S %Y", self, set_tmx);
}

Equivalent to strftime with argument '%a %b %e %T %Y' (or its shorthand form '%c'):

Date.new(2001, 2, 3).asctime # => "Sat Feb  3 00:00:00 2001"

See asctime.

Date#ctime is an alias for Date#asctime.

ctime

ext/date/date_core.c View on GitHub

An alias for asctime

cwday → integer

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_cwday(VALUE self)
{
    get_d1(self);
    return INT2FIX(m_cwday(dat));
}

Returns the commercial-date weekday index for self (see Date.commercial); 1 is Monday:

Date.new(2001, 2, 3).cwday # => 6

cweek → integer

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_cweek(VALUE self)
{
    get_d1(self);
    return INT2FIX(m_cweek(dat));
}

Returns commercial-date week index for self (see Date.commercial):

Date.new(2001, 2, 3).cweek # => 5

cwyear → integer

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_cwyear(VALUE self)
{
    get_d1(self);
    return m_real_cwyear(dat);
}

Returns commercial-date year for self (see Date.commercial):

Date.new(2001, 2, 3).cwyear # => 2001
Date.new(2000, 1, 1).cwyear # => 1999

day

ext/date/date_core.c View on GitHub

An alias for mday

day_fraction → rational

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_day_fraction(VALUE self)
{
    get_d1(self);
    if (simple_dat_p(dat))
        return INT2FIX(0);
    return m_fr(dat);
}

Returns the fractional part of the day in range (Rational(0, 1)…Rational(1, 1)):

DateTime.new(2001,2,3,12).day_fraction # => (1/2)

deconstruct_keys(array_of_names_or_nil) → hash

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_deconstruct_keys(VALUE self, VALUE keys)
{
    return deconstruct_keys(self, keys, /* is_datetime=false */ 0);
}

Returns a hash of the name/value pairs, to use in pattern matching. Possible keys are: :year, :month, :day, :wday, :yday.

Possible usages:

d = Date.new(2022, 10, 5)

if d in wday: 3, day: ..7  # uses deconstruct_keys underneath
  puts "first Wednesday of the month"
end
#=> prints "first Wednesday of the month"

case d
in year: ...2022
  puts "too old"
in month: ..9
  puts "quarter 1-3"
in wday: 1..5, month:
  puts "working day in month #{month}"
end
#=> prints "working day in month 10"

Note that deconstruction by pattern can also be combined with class check:

if d in Date(wday: 3, day: ..7)
  puts "first Wednesday of the month"
end

downto(min){|date| ... } → self

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_downto(VALUE self, VALUE min)
{
    VALUE date;

    RETURN_ENUMERATOR(self, 1, &min);

    date = self;
    while (FIX2INT(d_lite_cmp(date, min)) >= 0) {
        rb_yield(date);
        date = d_lite_plus(date, INT2FIX(-1));
    }
    return self;
}

Equivalent to step with arguments min and -1.

england → new_date

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_england(VALUE self)
{
    return dup_obj_with_new_start(self, ENGLAND);
}

Equivalent to Date#new_start with argument Date::ENGLAND.

friday? → true or false

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_friday_p(VALUE self)
{
    get_d1(self);
    return f_boolcast(m_wday(dat) == 5);
}

Returns true if self is a Friday, false otherwise.

gregorian → new_date

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_gregorian(VALUE self)
{
    return dup_obj_with_new_start(self, GREGORIAN);
}

Equivalent to Date#new_start with argument Date::GREGORIAN.

gregorian? → true or false

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_gregorian_p(VALUE self)
{
    get_d1(self);
    return f_boolcast(m_gregorian_p(dat));
}

Returns true if the date is on or after the date of calendar reform, false otherwise:

Date.new(1582, 10, 15).gregorian?       # => true
(Date.new(1582, 10, 15) - 1).gregorian? # => false

httpdate → string

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_httpdate(VALUE self)
{
    volatile VALUE dup = dup_obj_with_new_offset(self, 0);
    return strftimev("%a, %d %b %Y %T GMT", dup, set_tmx);
}

Equivalent to strftime with argument '%a, %d %b %Y %T GMT'; see Formats for Dates and Times:

Date.new(2001, 2, 3).httpdate # => "Sat, 03 Feb 2001 00:00:00 GMT"

infinite? → false

ext/date/lib/date.rb View on GitHub

          
            # File tmp/rubies/ruby-3.2.0/ext/date/lib/date.rb, line 13
def infinite?
  false
end

Returns false

inspect → string

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_inspect(VALUE self)
{
    get_d1(self);
    return mk_inspect(dat, rb_obj_class(self), self);
}

Returns a string representation of self:

Date.new(2001, 2, 3).inspect
# => "#<Date: 2001-02-03 ((2451944j,0s,0n),+0s,2299161j)>"

iso8601 → string

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_iso8601(VALUE self)
{
    return strftimev("%Y-%m-%d", self, set_tmx);
}

Equivalent to strftime with argument '%Y-%m-%d' (or its shorthand form '%F');

Date.new(2001, 2, 3).iso8601 # => "2001-02-03"

Date#xmlschema is an alias for Date#iso8601.

italy → new_date

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_italy(VALUE self)
{
    return dup_obj_with_new_start(self, ITALY);
}

Equivalent to Date#new_start with argument Date::ITALY.

d.jd → integer

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_jd(VALUE self)
{
    get_d1(self);
    return m_real_local_jd(dat);
}

Returns the Julian day number. This is a whole number, which is adjusted by the offset as the local time.

DateTime.new(2001,2,3,4,5,6,'+7').jd      #=> 2451944
DateTime.new(2001,2,3,4,5,6,'-7').jd      #=> 2451944

jisx0301 → string

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_jisx0301(VALUE self)
{
    char fmtbuf[JISX0301_DATE_SIZE];
    const char *fmt;

    get_d1(self);
    fmt = jisx0301_date_format(fmtbuf, sizeof(fmtbuf),
                               m_real_local_jd(dat),
                               m_real_year(dat));
    return strftimev(fmt, self, set_tmx);
}

Returns a string representation of the date in self in JIS X 0301 format.

Date.new(2001, 2, 3).jisx0301 # => "H13.02.03"

julian → new_date

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_julian(VALUE self)
{
    return dup_obj_with_new_start(self, JULIAN);
}

Equivalent to Date#new_start with argument Date::JULIAN.

d.julian? → true or false

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_julian_p(VALUE self)
{
    get_d1(self);
    return f_boolcast(m_julian_p(dat));
}

Returns true if the date is before the date of calendar reform, false otherwise:

(Date.new(1582, 10, 15) - 1).julian? # => true
Date.new(1582, 10, 15).julian?       # => false

ld → integer

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_ld(VALUE self)
{
    get_d1(self);
    return f_sub(m_real_local_jd(dat), INT2FIX(2299160));
}

Returns the Lilian day number, which is the number of days since the beginning of the Gregorian calendar, October 15, 1582.

Date.new(2001, 2, 3).ld # => 152784

leap? → true or false

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_leap_p(VALUE self)
{
    int rjd, ns, ry, rm, rd;

    get_d1(self);
    if (m_gregorian_p(dat))
        return f_boolcast(c_gregorian_leap_p(m_year(dat)));

    c_civil_to_jd(m_year(dat), 3, 1, m_virtual_sg(dat),
                  &rjd, &ns);
    c_jd_to_civil(rjd - 1, m_virtual_sg(dat), &ry, &rm, &rd);
    return f_boolcast(rd == 29);
}

Returns true if the year is a leap year, false otherwise:

Date.new(2000).leap? # => true
Date.new(2001).leap? # => false

mday -> integer

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_mday(VALUE self)
{
    get_d1(self);
    return INT2FIX(m_mday(dat));
}

Returns the day of the month in range (1..31):

Date.new(2001, 2, 3).mday # => 3

Date#day is an alias for Date#mday.

d.mjd → integer

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_mjd(VALUE self)
{
    get_d1(self);
    return f_sub(m_real_local_jd(dat), INT2FIX(2400001));
}

Returns the modified Julian day number. This is a whole number, which is adjusted by the offset as the local time.

DateTime.new(2001,2,3,4,5,6,'+7').mjd     #=> 51943
DateTime.new(2001,2,3,4,5,6,'-7').mjd     #=> 51943

mon → integer

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_mon(VALUE self)
{
    get_d1(self);
    return INT2FIX(m_mon(dat));
}

Returns the month in range (1..12):

Date.new(2001, 2, 3).mon # => 2

Date#month is an alias for Date#mon.

monday? → true or false

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_monday_p(VALUE self)
{
    get_d1(self);
    return f_boolcast(m_wday(dat) == 1);
}

Returns true if self is a Monday, false otherwise.

month

ext/date/date_core.c View on GitHub

An alias for mon

new_start(start = Date::ITALY]) → new_date

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_new_start(int argc, VALUE *argv, VALUE self)
{
    VALUE vsg;
    double sg;

    rb_scan_args(argc, argv, "01", &vsg);

    sg = DEFAULT_SG;
    if (argc >= 1)
        val2sg(vsg, sg);

    return dup_obj_with_new_start(self, sg);
}

Returns a copy of self with the given start value:

d0 = Date.new(2000, 2, 3)
d0.julian? # => false
d1 = d0.new_start(Date::JULIAN)
d1.julian? # => true

See argument start.

d.next → new_date

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_next(VALUE self)
{
    return d_lite_next_day(0, (VALUE *)NULL, self);
}

Returns a new Date object representing the following day:

d = Date.new(2001, 2, 3)
d.to_s      # => "2001-02-03"
d.next.to_s # => "2001-02-04"

Date#succ is an alias for Date#next.

next_day(n = 1) → new_date

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_next_day(int argc, VALUE *argv, VALUE self)
{
    VALUE n;

    rb_scan_args(argc, argv, "01", &n);
    if (argc < 1)
        n = INT2FIX(1);
    return d_lite_plus(self, n);
}

Equivalent to Date#+ with argument n.

next_month(n = 1) → new_date

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_next_month(int argc, VALUE *argv, VALUE self)
{
    VALUE n;

    rb_scan_args(argc, argv, "01", &n);
    if (argc < 1)
        n = INT2FIX(1);
    return d_lite_rshift(self, n);
}

Equivalent to >> with argument n.

next_year(n = 1) → new_date

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_next_year(int argc, VALUE *argv, VALUE self)
{
    VALUE n;

    rb_scan_args(argc, argv, "01", &n);
    if (argc < 1)
        n = INT2FIX(1);
    return d_lite_rshift(self, f_mul(n, INT2FIX(12)));
}

Equivalent to >> with argument n * 12.

prev_day(n = 1) → new_date

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_prev_day(int argc, VALUE *argv, VALUE self)
{
    VALUE n;

    rb_scan_args(argc, argv, "01", &n);
    if (argc < 1)
        n = INT2FIX(1);
    return d_lite_minus(self, n);
}

Equivalent to Date#- with argument n.

prev_month(n = 1) → new_date

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_prev_month(int argc, VALUE *argv, VALUE self)
{
    VALUE n;

    rb_scan_args(argc, argv, "01", &n);
    if (argc < 1)
        n = INT2FIX(1);
    return d_lite_lshift(self, n);
}

Equivalent to << with argument n.

prev_year(n = 1) → new_date

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_prev_year(int argc, VALUE *argv, VALUE self)
{
    VALUE n;

    rb_scan_args(argc, argv, "01", &n);
    if (argc < 1)
        n = INT2FIX(1);
    return d_lite_lshift(self, f_mul(n, INT2FIX(12)));
}

Equivalent to << with argument n * 12.

rfc2822 → string

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_rfc2822(VALUE self)
{
    return strftimev("%a, %-d %b %Y %T %z", self, set_tmx);
}

Equivalent to strftime with argument '%a, %-d %b %Y %T %z'; see Formats for Dates and Times:

Date.new(2001, 2, 3).rfc2822 # => "Sat, 3 Feb 2001 00:00:00 +0000"

Date#rfc822 is an alias for Date#rfc2822.

rfc3339 → string

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_rfc3339(VALUE self)
{
    return strftimev("%Y-%m-%dT%H:%M:%S%:z", self, set_tmx);
}

Equivalent to strftime with argument '%FT%T%:z'; see Formats for Dates and Times:

Date.new(2001, 2, 3).rfc3339 # => "2001-02-03T00:00:00+00:00"

rfc822

ext/date/date_core.c View on GitHub

An alias for rfc2822

saturday? → true or false

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_saturday_p(VALUE self)
{
    get_d1(self);
    return f_boolcast(m_wday(dat) == 6);
}

Returns true if self is a Saturday, false otherwise.

start → float

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_start(VALUE self)
{
    get_d1(self);
    return DBL2NUM(m_sg(dat));
}

Returns the Julian start date for calendar reform; if not an infinity, the returned value is suitable for passing to Date#jd:

d = Date.new(2001, 2, 3, Date::ITALY)
s = d.start     # => 2299161.0
Date.jd(s).to_s # => "1582-10-15"

d = Date.new(2001, 2, 3, Date::ENGLAND)
s = d.start     # => 2361222.0
Date.jd(s).to_s # => "1752-09-14"

Date.new(2001, 2, 3, Date::GREGORIAN).start # => -Infinity
Date.new(2001, 2, 3, Date::JULIAN).start    # => Infinity

See argument start.

step(limit, step = 1){|date| ... } → self

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_step(int argc, VALUE *argv, VALUE self)
{
    VALUE limit, step, date;
    int c;

    rb_scan_args(argc, argv, "11", &limit, &step);

    if (argc < 2)
        step = INT2FIX(1);

#if 0
    if (f_zero_p(step))
        rb_raise(rb_eArgError, "step can't be 0");
#endif

    RETURN_ENUMERATOR(self, argc, argv);

    date = self;
    c = f_cmp(step, INT2FIX(0));
    if (c < 0) {
        while (FIX2INT(d_lite_cmp(date, limit)) >= 0) {
            rb_yield(date);
            date = d_lite_plus(date, step);
        }
    }
    else if (c == 0) {
        while (1)
            rb_yield(date);
    }
    else /* if (c > 0) */ {
        while (FIX2INT(d_lite_cmp(date, limit)) <= 0) {
            rb_yield(date);
            date = d_lite_plus(date, step);
        }
    }
    return self;
}

Calls the block with specified dates; returns self.

The first date is self.
Each successive date is date + step, where step is the numeric step size in days.
The last date is the last one that is before or equal to limit, which should be a Date object.

Example:

limit = Date.new(2001, 12, 31)
Date.new(2001).step(limit){|date| p date.to_s if date.mday == 31 }

Output:

"2001-01-31"
"2001-03-31"
"2001-05-31"
"2001-07-31"
"2001-08-31"
"2001-10-31"
"2001-12-31"

Returns an Enumerator if no block is given.

strftime(format = '%F') → string

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_strftime(int argc, VALUE *argv, VALUE self)
{
    return date_strftime_internal(argc, argv, self,
                                  "%Y-%m-%d", set_tmx);
}

Returns a string representation of the date in self, formatted according the given format:

Date.new(2001, 2, 3).strftime # => "2001-02-03"

For other formats, see Formats for Dates and Times.

succ

ext/date/date_core.c View on GitHub

An alias for next

sunday? → true or false

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_sunday_p(VALUE self)
{
    get_d1(self);
    return f_boolcast(m_wday(dat) == 0);
}

Returns true if self is a Sunday, false otherwise.

thursday? → true or false

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_thursday_p(VALUE self)
{
    get_d1(self);
    return f_boolcast(m_wday(dat) == 4);
}

Returns true if self is a Thursday, false otherwise.

to_date → self

ext/date/date_core.c View on GitHub

          
            static VALUE
date_to_date(VALUE self)
{
    return self;
}

Returns self.

d.to_datetime → datetime

ext/date/date_core.c View on GitHub

          
            static VALUE
date_to_datetime(VALUE self)
{
    get_d1a(self);

    if (simple_dat_p(adat)) {
        VALUE new = d_lite_s_alloc_simple(cDateTime);
        {
            get_d1b(new);
            bdat->s = adat->s;
            return new;
        }
    }
    else {
        VALUE new = d_lite_s_alloc_complex(cDateTime);
        {
            get_d1b(new);
            bdat->c = adat->c;
            bdat->c.df = 0;
            RB_OBJ_WRITE(new, &bdat->c.sf, INT2FIX(0));
#ifndef USE_PACK
            bdat->c.hour = 0;
            bdat->c.min = 0;
            bdat->c.sec = 0;
#else
            bdat->c.pc = PACK5(EX_MON(adat->c.pc), EX_MDAY(adat->c.pc),
                               0, 0, 0);
            bdat->c.flags |= HAVE_DF | HAVE_TIME;
#endif
            return new;
        }
    }
}

Returns a DateTime whose value is the same as self:

Date.new(2001, 2, 3).to_datetime # => #<DateTime: 2001-02-03T00:00:00+00:00>

to_json(*args)

ext/json/lib/json/add/date.rb View on GitHub

          
            # File tmp/rubies/ruby-3.2.0/ext/json/lib/json/add/date.rb, line 31
def to_json(*args)
  as_json.to_json(*args)
end

Stores class name (Date) with Julian year y, month m, day d and Day of Calendar Reform sg as JSON string

to_s → string

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_to_s(VALUE self)
{
    return strftimev("%Y-%m-%d", self, set_tmx);
}

Returns a string representation of the date in self in ISO 8601 extended date format ('%Y-%m-%d'):

Date.new(2001, 2, 3).to_s # => "2001-02-03"

to_time → time

ext/date/date_core.c View on GitHub

          
            static VALUE
date_to_time(VALUE self)
{
    get_d1a(self);

    if (m_julian_p(adat)) {
        VALUE tmp = d_lite_gregorian(self);
        get_d1b(tmp);
        adat = bdat;
    }

    return f_local3(rb_cTime,
        m_real_year(adat),
        INT2FIX(m_mon(adat)),
        INT2FIX(m_mday(adat)));
}

Returns a new Time object with the same value as self; if self is a Julian date, derives its Gregorian date for conversion to the Time object:

Date.new(2001, 2, 3).to_time               # => 2001-02-03 00:00:00 -0600
Date.new(2001, 2, 3, Date::JULIAN).to_time # => 2001-02-16 00:00:00 -0600

tuesday? → true or false

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_tuesday_p(VALUE self)
{
    get_d1(self);
    return f_boolcast(m_wday(dat) == 2);
}

Returns true if self is a Tuesday, false otherwise.

upto(max){|date| ... } → self

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_upto(VALUE self, VALUE max)
{
    VALUE date;

    RETURN_ENUMERATOR(self, 1, &max);

    date = self;
    while (FIX2INT(d_lite_cmp(date, max)) <= 0) {
        rb_yield(date);
        date = d_lite_plus(date, INT2FIX(1));
    }
    return self;
}

Equivalent to step with arguments max and 1.

wday → integer

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_wday(VALUE self)
{
    get_d1(self);
    return INT2FIX(m_wday(dat));
}

Returns the day of week in range (0..6); Sunday is 0:

Date.new(2001, 2, 3).wday # => 6

wednesday? → true or false

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_wednesday_p(VALUE self)
{
    get_d1(self);
    return f_boolcast(m_wday(dat) == 3);
}

Returns true if self is a Wednesday, false otherwise.

xmlschema

ext/date/date_core.c View on GitHub

An alias for iso8601

yday → integer

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_yday(VALUE self)
{
    get_d1(self);
    return INT2FIX(m_yday(dat));
}

Returns the day of the year, in range (1..366):

Date.new(2001, 2, 3).yday # => 34

year → integer

ext/date/date_core.c View on GitHub

          
            static VALUE
d_lite_year(VALUE self)
{
    get_d1(self);
    return m_real_year(dat);
}

Returns the year:

Date.new(2001, 2, 3).year    # => 2001
(Date.new(1, 1, 1) - 1).year # => 0

Creating a Date

Argument limit

Date._httpdate(string, limit: 128) → hash

Date._iso8601(string, limit: 128) → hash

Date._jisx0301(string, limit: 128) → hash

Date._parse(string, comp = true, limit: 128) → hash

Date._rfc2822(string, limit: 128) → hash

Date._rfc3339(string, limit: 128) → hash

Date._rfc2822(string, limit: 128) → hash

Date._strptime(string, format = '%F') → hash

Date._xmlschema(string, limit: 128) → hash

civil(*args)

Date.commercial(cwyear = -4712, cweek = 1, cwday = 1, start = Date::ITALY) → date

Date.gregorian_leap?(year) → true or false

Date.httpdate(string = 'Mon, 01 Jan -4712 00:00:00 GMT', start = Date::ITALY, limit: 128) → date

Date.iso8601(string = '-4712-01-01', start = Date::ITALY, limit: 128) → date

Date.jd(jd = 0, start = Date::ITALY) → date

Date.jisx0301(string = '-4712-01-01', start = Date::ITALY, limit: 128) → date

json_create(object)

Date.julian_leap?(year) → true or false

Date.gregorian_leap?(year) → true or false

Date.new(year = -4712, month = 1, mday = 1, start = Date::ITALY) → date

Date.ordinal(year = -4712, yday = 1, start = Date::ITALY) → date

Date.parse(string = '-4712-01-01', comp = true, start = Date::ITALY, limit: 128) → date

Date.rfc2822(string = 'Mon, 1 Jan -4712 00:00:00 +0000', start = Date::ITALY, limit: 128) → date

Date.rfc3339(string = '-4712-01-01T00:00:00+00:00', start = Date::ITALY, limit: 128) → date

Date.rfc2822(string = 'Mon, 1 Jan -4712 00:00:00 +0000', start = Date::ITALY, limit: 128) → date

Date.strptime(string = '-4712-01-01', format = '%F', start = Date::ITALY) → date

Date.today(start = Date::ITALY) → date

Date.valid_civil?(year, month, mday, start = Date::ITALY) → true or false

Date.valid_commercial?(cwyear, cweek, cwday, start = Date::ITALY) → true or false

Date.valid_civil?(year, month, mday, start = Date::ITALY) → true or false

Date.valid_jd?(jd, start = Date::ITALY) → true

Date.valid_ordinal?(year, yday, start = Date::ITALY) → true or false

Date.xmlschema(string = '-4712-01-01', start = Date::ITALY, limit: 128) → date

d + other → date

d - other → date or rational

d << n → date

self <=> other → -1, 0, 1 or nil

self === other → true, false, or nil.

d >> n → new_date

d.ajd → rational

d.amjd → rational

as_json(*)

asctime -> string

ctime

cwday → integer

cweek → integer

cwyear → integer

day

day_fraction → rational

deconstruct_keys(array_of_names_or_nil) → hash

downto(min){|date| ... } → self

england → new_date

friday? → true or false

gregorian → new_date

gregorian? → true or false

httpdate → string

infinite? → false

inspect → string

iso8601 → string

italy → new_date

d.jd → integer

jisx0301 → string

julian → new_date

d.julian? → true or false

ld → integer

leap? → true or false

mday -> integer

d.mjd → integer

mon → integer

monday? → true or false

month

new_start(start = Date::ITALY]) → new_date

d.next → new_date

next_day(n = 1) → new_date

next_month(n = 1) → new_date

next_year(n = 1) → new_date

prev_day(n = 1) → new_date

prev_month(n = 1) → new_date

Argument `limit`