Retunrs true if the date is on or after the day of calendar reform.
Date.new(1582,10,15).gregorian? #=> true (Date.new(1582,10,15) - 1).gregorian? #=> false
Returns the Julian day number denoting the day of calendar reform.
Date.new(2001,2,3).start #=> 2299161.0 Date.new(2001,2,3,Date::GREGORIAN).start #=> -Infinity
This method is equivalent to new_start(Date::ENGLAND).
This method is equivalent to new_start(Date::GREGORIAN).
Iterates evaluation of the given block, which takes a date object. The limit should be a date object.
Date.new(2001).step(Date.new(2001,-1,-1)).select{|d| d.sunday?}.size #=> 52
Returns the value as a string for inspection.
Date.new(2001,2,3).inspect #=> "#<Date: 2001-02-03 ((2451944j,0s,0n),+0s,2299161j)>" DateTime.new(2001,2,3,4,5,6,'-7').inspect #=> "#<DateTime: 2001-02-03T04:05:06-07:00 ((2451944j,39906s,0n),-25200s,2299161j)>"
Creates a date-time object denoting the given ordinal date.
DateTime.ordinal(2001,34) #=> #<DateTime: 2001-02-03T00:00:00+00:00 ...> DateTime.ordinal(2001,34,4,5,6,'+7') #=> #<DateTime: 2001-02-03T04:05:06+07:00 ...> DateTime.ordinal(2001,-332,-20,-55,-54,'+7') #=> #<DateTime: 2001-02-03T04:05:06+07:00 ...>
Returns a string representing time. Equivalent to calling strftime with the appropriate format string.
t = Time.now t.to_s => "2012-11-10 18:16:12 +0100" t.strftime "%Y-%m-%d %H:%M:%S %z" => "2012-11-10 18:16:12 +0100" t.utc.to_s => "2012-11-10 17:16:12 UTC" t.strftime "%Y-%m-%d %H:%M:%S UTC" => "2012-11-10 17:16:12 UTC"
Returns the minute of the hour (0..59) for time.
t = Time.now #=> 2007-11-19 08:25:51 -0600 t.min #=> 25
Returns true if time occurs during Daylight Saving Time in its time zone.
# CST6CDT: Time.local(2000, 1, 1).zone #=> "CST" Time.local(2000, 1, 1).isdst #=> false Time.local(2000, 1, 1).dst? #=> false Time.local(2000, 7, 1).zone #=> "CDT" Time.local(2000, 7, 1).isdst #=> true Time.local(2000, 7, 1).dst? #=> true # Asia/Tokyo: Time.local(2000, 1, 1).zone #=> "JST" Time.local(2000, 1, 1).isdst #=> false Time.local(2000, 1, 1).dst? #=> false Time.local(2000, 7, 1).zone #=> "JST" Time.local(2000, 7, 1).isdst #=> false Time.local(2000, 7, 1).dst? #=> false
Returns true if time occurs during Daylight Saving Time in its time zone.
# CST6CDT: Time.local(2000, 1, 1).zone #=> "CST" Time.local(2000, 1, 1).isdst #=> false Time.local(2000, 1, 1).dst? #=> false Time.local(2000, 7, 1).zone #=> "CDT" Time.local(2000, 7, 1).isdst #=> true Time.local(2000, 7, 1).dst? #=> true # Asia/Tokyo: Time.local(2000, 1, 1).zone #=> "JST" Time.local(2000, 1, 1).isdst #=> false Time.local(2000, 1, 1).dst? #=> false Time.local(2000, 7, 1).zone #=> "JST" Time.local(2000, 7, 1).isdst #=> false Time.local(2000, 7, 1).dst? #=> false
Returns true if time represents Friday.
t = Time.local(1987, 12, 18) #=> 1987-12-18 00:00:00 -0600 t.friday? #=> true
Stores the specified string value in the database, indexed via the string key provided.
Returns the number of entries in the database.
Returns a Hash (not a DBM database) created by using each value in the database as a key, with the corresponding key as its value.
Returns true if the database contains the specified key, false otherwise.
Describe the contents of this struct in a string.
Returns the number of struct members.
Customer = Struct.new(:name, :address, :zip) joe = Customer.new("Joe Smith", "123 Maple, Anytown NC", 12345) joe.length #=> 3
Tries to set console size. The effect depends on the platform and the running environment.
You must require ‘io/console’ to use this method.
Returns status information for ios as an object of type File::Stat.
f = File.new("testfile") s = f.stat "%o" % s.mode #=> "100644" s.blksize #=> 4096 s.atime #=> Wed Apr 09 08:53:54 CDT 2003
Reads the entire file specified by name as individual lines, and returns those lines in an array. Lines are separated by sep.
a = IO.readlines("testfile") a[0] #=> "This is line one\n"
If the last argument is a hash, it’s the keyword argument to open. See IO.read for detail.
Opens the file, optionally seeks to the given offset, then returns length bytes (defaulting to the rest of the file). binread ensures the file is closed before returning. The open mode would be “rb:ASCII-8BIT”.
IO.binread("testfile") #=> "This is line one\nThis is line two\nThis is line three\nAnd so on...\n" IO.binread("testfile", 20) #=> "This is line one\nThi" IO.binread("testfile", 20, 10) #=> "ne one\nThis is line "