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# ## DateTime
#
# A subclass of Date that easily handles date, hour, minute, second, and offset.
#
# DateTime does not consider any leap seconds, does not track any summer time
# rules.
#
# A DateTime object is created with DateTime::new, DateTime::jd,
# DateTime::ordinal, DateTime::commercial, DateTime::parse, DateTime::strptime,
# DateTime::now, Time#to_datetime, etc.
#
# require 'date'
#
# DateTime.new(2001,2,3,4,5,6)
# #=> #<DateTime: 2001-02-03T04:05:06+00:00 ...>
#
# The last element of day, hour, minute, or second can be a fractional number.
# The fractional number's precision is assumed at most nanosecond.
#
# DateTime.new(2001,2,3.5)
# #=> #<DateTime: 2001-02-03T12:00:00+00:00 ...>
#
# An optional argument, the offset, indicates the difference between the local
# time and UTC. For example, `Rational(3,24)` represents ahead of 3 hours of
# UTC, `Rational(-5,24)` represents behind of 5 hours of UTC. The offset should
# be -1 to +1, and its precision is assumed at most second. The default value is
# zero (equals to UTC).
#
# DateTime.new(2001,2,3,4,5,6,Rational(3,24))
# #=> #<DateTime: 2001-02-03T04:05:06+03:00 ...>
#
# The offset also accepts string form:
#
# DateTime.new(2001,2,3,4,5,6,'+03:00')
# #=> #<DateTime: 2001-02-03T04:05:06+03:00 ...>
#
# An optional argument, the day of calendar reform (`start`), denotes a Julian
# day number, which should be 2298874 to 2426355 or negative/positive infinity.
# The default value is `Date::ITALY` (2299161=1582-10-15).
#
# A DateTime object has various methods. See each reference.
#
# d = DateTime.parse('3rd Feb 2001 04:05:06+03:30')
# #=> #<DateTime: 2001-02-03T04:05:06+03:30 ...>
# d.hour #=> 4
# d.min #=> 5
# d.sec #=> 6
# d.offset #=> (7/48)
# d.zone #=> "+03:30"
# d += Rational('1.5')
# #=> #<DateTime: 2001-02-04%16:05:06+03:30 ...>
# d = d.new_offset('+09:00')
# #=> #<DateTime: 2001-02-04%21:35:06+09:00 ...>
# d.strftime('%I:%M:%S %p')
# #=> "09:35:06 PM"
# d > DateTime.new(1999)
# #=> true
#
# ### When should you use DateTime and when should you use Time?
#
# It's a common misconception that [William
# Shakespeare](http://en.wikipedia.org/wiki/William_Shakespeare) and [Miguel de
# Cervantes](http://en.wikipedia.org/wiki/Miguel_de_Cervantes) died on the same
# day in history - so much so that UNESCO named April 23 as [World Book Day
# because of this fact](http://en.wikipedia.org/wiki/World_Book_Day). However,
# because England hadn't yet adopted the [Gregorian Calendar
# Reform](http://en.wikipedia.org/wiki/Gregorian_calendar#Gregorian_reform) (and
# wouldn't until
# [1752](http://en.wikipedia.org/wiki/Calendar_(New_Style)_Act_1750)) their
# deaths are actually 10 days apart. Since Ruby's Time class implements a
# [proleptic Gregorian
# calendar](http://en.wikipedia.org/wiki/Proleptic_Gregorian_calendar) and has
# no concept of calendar reform there's no way to express this with Time
# objects. This is where DateTime steps in:
#
# shakespeare = DateTime.iso8601('1616-04-23', Date::ENGLAND)
# #=> Tue, 23 Apr 1616 00:00:00 +0000
# cervantes = DateTime.iso8601('1616-04-23', Date::ITALY)
# #=> Sat, 23 Apr 1616 00:00:00 +0000
#
# Already you can see something is weird - the days of the week are different.
# Taking this further:
#
# cervantes == shakespeare
# #=> false
# (shakespeare - cervantes).to_i
# #=> 10
#
# This shows that in fact they died 10 days apart (in reality 11 days since
# Cervantes died a day earlier but was buried on the 23rd). We can see the
# actual date of Shakespeare's death by using the #gregorian method to convert
# it:
#
# shakespeare.gregorian
# #=> Tue, 03 May 1616 00:00:00 +0000
#
# So there's an argument that all the celebrations that take place on the 23rd
# April in Stratford-upon-Avon are actually the wrong date since England is now
# using the Gregorian calendar. You can see why when we transition across the
# reform date boundary:
#
# # start off with the anniversary of Shakespeare's birth in 1751
# shakespeare = DateTime.iso8601('1751-04-23', Date::ENGLAND)
# #=> Tue, 23 Apr 1751 00:00:00 +0000
#
# # add 366 days since 1752 is a leap year and April 23 is after February 29
# shakespeare + 366
# #=> Thu, 23 Apr 1752 00:00:00 +0000
#
# # add another 365 days to take us to the anniversary in 1753
# shakespeare + 366 + 365
# #=> Fri, 04 May 1753 00:00:00 +0000
#
# As you can see, if we're accurately tracking the number of [solar
# years](http://en.wikipedia.org/wiki/Tropical_year) since Shakespeare's
# birthday then the correct anniversary date would be the 4th May and not the
# 23rd April.
#
# So when should you use DateTime in Ruby and when should you use Time? Almost
# certainly you'll want to use Time since your app is probably dealing with
# current dates and times. However, if you need to deal with dates and times in
# a historical context you'll want to use DateTime to avoid making the same
# mistakes as UNESCO. If you also have to deal with timezones then best of luck
# - just bear in mind that you'll probably be dealing with [local solar
# times](http://en.wikipedia.org/wiki/Solar_time), since it wasn't until the
# 19th century that the introduction of the railways necessitated the need for
# [Standard Time](http://en.wikipedia.org/wiki/Standard_time#Great_Britain) and
# eventually timezones.
#
class DateTime < Date
# Creates a DateTime object denoting the given calendar date.
#
# DateTime.new(2001,2,3) #=> #<DateTime: 2001-02-03T00:00:00+00:00 ...>
# DateTime.new(2001,2,3,4,5,6,'+7')
# #=> #<DateTime: 2001-02-03T04:05:06+07:00 ...>
# DateTime.new(2001,-11,-26,-20,-55,-54,'+7')
# #=> #<DateTime: 2001-02-03T04:05:06+07:00 ...>
#
def initialize: (?Integer year, ?Integer month, ?Integer mday, ?Integer hour, ?Integer minute, ?Integer second, ?Integer offset, ?Integer start) -> void
# Parses the given representation of date and time with the given template, and
# returns a hash of parsed elements. _strptime does not support specification
# of flags and width unlike strftime.
#
# See also strptime(3) and #strftime.
#
def self._strptime: (String str, ?String format) -> Hash[Symbol, Integer | String]
# Creates a DateTime object denoting the given calendar date.
#
# DateTime.new(2001,2,3) #=> #<DateTime: 2001-02-03T00:00:00+00:00 ...>
# DateTime.new(2001,2,3,4,5,6,'+7')
# #=> #<DateTime: 2001-02-03T04:05:06+07:00 ...>
# DateTime.new(2001,-11,-26,-20,-55,-54,'+7')
# #=> #<DateTime: 2001-02-03T04:05:06+07:00 ...>
#
def self.civil: (?Integer year, ?Integer month, ?Integer mday, ?Integer hour, ?Integer minute, ?Integer second, ?Integer offset, ?Integer start) -> DateTime
# Creates a DateTime object denoting the given week date.
#
# DateTime.commercial(2001) #=> #<DateTime: 2001-01-01T00:00:00+00:00 ...>
# DateTime.commercial(2002) #=> #<DateTime: 2001-12-31T00:00:00+00:00 ...>
# DateTime.commercial(2001,5,6,4,5,6,'+7')
# #=> #<DateTime: 2001-02-03T04:05:06+07:00 ...>
#
def self.commercial: (?Integer cwyear, ?Integer cweek, ?Integer cwday, ?Integer hour, ?Integer minute, ?Integer second, ?Integer offset, ?Integer start) -> DateTime
# Creates a new DateTime object by parsing from a string according to some RFC
# 2616 format.
#
# DateTime.httpdate('Sat, 03 Feb 2001 04:05:06 GMT')
# #=> #<DateTime: 2001-02-03T04:05:06+00:00 ...>
#
def self.httpdate: (String str, ?Integer start) -> DateTime
# Creates a new DateTime object by parsing from a string according to some
# typical ISO 8601 formats.
#
# DateTime.iso8601('2001-02-03T04:05:06+07:00')
# #=> #<DateTime: 2001-02-03T04:05:06+07:00 ...>
# DateTime.iso8601('20010203T040506+0700')
# #=> #<DateTime: 2001-02-03T04:05:06+07:00 ...>
# DateTime.iso8601('2001-W05-6T04:05:06+07:00')
# #=> #<DateTime: 2001-02-03T04:05:06+07:00 ...>
#
def self.iso8601: (String str, ?Integer start) -> DateTime
# Creates a DateTime object denoting the given chronological Julian day number.
#
# DateTime.jd(2451944) #=> #<DateTime: 2001-02-03T00:00:00+00:00 ...>
# DateTime.jd(2451945) #=> #<DateTime: 2001-02-04T00:00:00+00:00 ...>
# DateTime.jd(Rational('0.5'))
# #=> #<DateTime: -4712-01-01T12:00:00+00:00 ...>
#
def self.jd: (?Integer jd, ?Integer hour, ?Integer minute, ?Integer second, ?Integer offset, ?Integer start) -> DateTime
# Creates a new DateTime object by parsing from a string according to some
# typical JIS X 0301 formats.
#
# DateTime.jisx0301('H13.02.03T04:05:06+07:00')
# #=> #<DateTime: 2001-02-03T04:05:06+07:00 ...>
#
# For no-era year, legacy format, Heisei is assumed.
#
# DateTime.jisx0301('13.02.03T04:05:06+07:00')
# #=> #<DateTime: 2001-02-03T04:05:06+07:00 ...>
#
def self.jisx0301: (String str, ?Integer start) -> DateTime
# Creates a DateTime object denoting the present time.
#
# DateTime.now #=> #<DateTime: 2011-06-11T21:20:44+09:00 ...>
#
def self.now: (?Integer start) -> DateTime
# Creates a DateTime 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 ...>
#
def self.ordinal: (?Integer year, ?Integer yday, ?Integer hour, ?Integer minute, ?Integer second, ?Integer offset, ?Integer start) -> DateTime
# Parses the given representation of date and time, and creates a DateTime
# object. This method does not function as a validator.
#
# If the optional second argument is true and the detected year is in the range
# "00" to "99", makes it full.
#
# DateTime.parse('2001-02-03T04:05:06+07:00')
# #=> #<DateTime: 2001-02-03T04:05:06+07:00 ...>
# DateTime.parse('20010203T040506+0700')
# #=> #<DateTime: 2001-02-03T04:05:06+07:00 ...>
# DateTime.parse('3rd Feb 2001 04:05:06 PM')
# #=> #<DateTime: 2001-02-03T16:05:06+00:00 ...>
#
def self.parse: (String str, ?boolish complete, ?Integer start) -> DateTime
# Creates a new DateTime object by parsing from a string according to some
# typical RFC 2822 formats.
#
# DateTime.rfc2822('Sat, 3 Feb 2001 04:05:06 +0700')
# #=> #<DateTime: 2001-02-03T04:05:06+07:00 ...>
#
def self.rfc2822: (String str, ?Integer start) -> DateTime
# Creates a new DateTime object by parsing from a string according to some
# typical RFC 3339 formats.
#
# DateTime.rfc3339('2001-02-03T04:05:06+07:00')
# #=> #<DateTime: 2001-02-03T04:05:06+07:00 ...>
#
def self.rfc3339: (String str, ?Integer start) -> DateTime
# Creates a new DateTime object by parsing from a string according to some
# typical RFC 2822 formats.
#
# DateTime.rfc2822('Sat, 3 Feb 2001 04:05:06 +0700')
# #=> #<DateTime: 2001-02-03T04:05:06+07:00 ...>
#
def self.rfc822: (String str, ?Integer start) -> DateTime
# Parses the given representation of date and time with the given template, and
# creates a DateTime object. strptime does not support specification of flags
# and width unlike strftime.
#
# DateTime.strptime('2001-02-03T04:05:06+07:00', '%Y-%m-%dT%H:%M:%S%z')
# #=> #<DateTime: 2001-02-03T04:05:06+07:00 ...>
# DateTime.strptime('03-02-2001 04:05:06 PM', '%d-%m-%Y %I:%M:%S %p')
# #=> #<DateTime: 2001-02-03T16:05:06+00:00 ...>
# DateTime.strptime('2001-W05-6T04:05:06+07:00', '%G-W%V-%uT%H:%M:%S%z')
# #=> #<DateTime: 2001-02-03T04:05:06+07:00 ...>
# DateTime.strptime('2001 04 6 04 05 06 +7', '%Y %U %w %H %M %S %z')
# #=> #<DateTime: 2001-02-03T04:05:06+07:00 ...>
# DateTime.strptime('2001 05 6 04 05 06 +7', '%Y %W %u %H %M %S %z')
# #=> #<DateTime: 2001-02-03T04:05:06+07:00 ...>
# DateTime.strptime('-1', '%s')
# #=> #<DateTime: 1969-12-31T23:59:59+00:00 ...>
# DateTime.strptime('-1000', '%Q')
# #=> #<DateTime: 1969-12-31T23:59:59+00:00 ...>
# DateTime.strptime('sat3feb014pm+7', '%a%d%b%y%H%p%z')
# #=> #<DateTime: 2001-02-03T16:00:00+07:00 ...>
#
# See also strptime(3) and #strftime.
#
def self.strptime: (String str, ?String format, ?Integer start) -> DateTime
# Creates a new DateTime object by parsing from a string according to some
# typical XML Schema formats.
#
# DateTime.xmlschema('2001-02-03T04:05:06+07:00')
# #=> #<DateTime: 2001-02-03T04:05:06+07:00 ...>
#
def self.xmlschema: (String str, ?Integer start) -> DateTime
public
# Returns the hour (0-23).
#
# DateTime.new(2001,2,3,4,5,6).hour #=> 4
#
def hour: () -> Integer
# This method is equivalent to strftime('%FT%T%:z'). The optional argument `n`
# is the number of digits for fractional seconds.
#
# DateTime.parse('2001-02-03T04:05:06.123456789+07:00').iso8601(9)
# #=> "2001-02-03T04:05:06.123456789+07:00"
#
def iso8601: (?Integer n) -> String
# Returns a string in a JIS X 0301 format. The optional argument `n` is the
# number of digits for fractional seconds.
#
# DateTime.parse('2001-02-03T04:05:06.123456789+07:00').jisx0301(9)
# #=> "H13.02.03T04:05:06.123456789+07:00"
#
def jisx0301: (?Integer n) -> String
# Returns the minute (0-59).
#
# DateTime.new(2001,2,3,4,5,6).min #=> 5
#
def min: () -> Integer
# Returns the minute (0-59).
#
# DateTime.new(2001,2,3,4,5,6).min #=> 5
#
def minute: () -> Integer
# Duplicates self and resets its offset.
#
# d = DateTime.new(2001,2,3,4,5,6,'-02:00')
# #=> #<DateTime: 2001-02-03T04:05:06-02:00 ...>
# d.new_offset('+09:00') #=> #<DateTime: 2001-02-03T15:05:06+09:00 ...>
#
def new_offset: (?String offset) -> DateTime
# Returns the offset.
#
# DateTime.parse('04pm+0730').offset #=> (5/16)
#
def offset: () -> Rational
# This method is equivalent to strftime('%FT%T%:z'). The optional argument `n`
# is the number of digits for fractional seconds.
#
# DateTime.parse('2001-02-03T04:05:06.123456789+07:00').rfc3339(9)
# #=> "2001-02-03T04:05:06.123456789+07:00"
#
def rfc3339: (?Integer n) -> String
# Returns the second (0-59).
#
# DateTime.new(2001,2,3,4,5,6).sec #=> 6
#
def sec: () -> Integer
# Returns the fractional part of the second.
#
# DateTime.new(2001,2,3,4,5,6.5).sec_fraction #=> (1/2)
#
def sec_fraction: () -> Rational
# Returns the second (0-59).
#
# DateTime.new(2001,2,3,4,5,6).sec #=> 6
#
def second: () -> Integer
# Returns the fractional part of the second.
#
# DateTime.new(2001,2,3,4,5,6.5).sec_fraction #=> (1/2)
#
def second_fraction: () -> Rational
# Formats date according to the directives in the given format string. The
# directives begin with a percent (%) character. Any text not listed as a
# directive will be passed through to the output string.
#
# A directive consists of a percent (%) character, zero or more flags, an
# optional minimum field width, an optional modifier, and a conversion specifier
# as follows.
#
# %<flags><width><modifier><conversion>
#
# Flags:
# - don't pad a numerical output.
# _ use spaces for padding.
# 0 use zeros for padding.
# ^ upcase the result string.
# # change case.
# : use colons for %z.
#
# The minimum field width specifies the minimum width.
#
# The modifiers are "E" and "O". They are ignored.
#
# Format directives:
#
# Date (Year, Month, Day):
# %Y - Year with century (can be negative, 4 digits at least)
# -0001, 0000, 1995, 2009, 14292, etc.
# %C - year / 100 (round down. 20 in 2009)
# %y - year % 100 (00..99)
#
# %m - Month of the year, zero-padded (01..12)
# %_m blank-padded ( 1..12)
# %-m no-padded (1..12)
# %B - The full month name (``January'')
# %^B uppercased (``JANUARY'')
# %b - The abbreviated month name (``Jan'')
# %^b uppercased (``JAN'')
# %h - Equivalent to %b
#
# %d - Day of the month, zero-padded (01..31)
# %-d no-padded (1..31)
# %e - Day of the month, blank-padded ( 1..31)
#
# %j - Day of the year (001..366)
#
# Time (Hour, Minute, Second, Subsecond):
# %H - Hour of the day, 24-hour clock, zero-padded (00..23)
# %k - Hour of the day, 24-hour clock, blank-padded ( 0..23)
# %I - Hour of the day, 12-hour clock, zero-padded (01..12)
# %l - Hour of the day, 12-hour clock, blank-padded ( 1..12)
# %P - Meridian indicator, lowercase (``am'' or ``pm'')
# %p - Meridian indicator, uppercase (``AM'' or ``PM'')
#
# %M - Minute of the hour (00..59)
#
# %S - Second of the minute (00..60)
#
# %L - Millisecond of the second (000..999)
# %N - Fractional seconds digits, default is 9 digits (nanosecond)
# %3N millisecond (3 digits) %15N femtosecond (15 digits)
# %6N microsecond (6 digits) %18N attosecond (18 digits)
# %9N nanosecond (9 digits) %21N zeptosecond (21 digits)
# %12N picosecond (12 digits) %24N yoctosecond (24 digits)
#
# Time zone:
# %z - Time zone as hour and minute offset from UTC (e.g. +0900)
# %:z - hour and minute offset from UTC with a colon (e.g. +09:00)
# %::z - hour, minute and second offset from UTC (e.g. +09:00:00)
# %:::z - hour, minute and second offset from UTC
# (e.g. +09, +09:30, +09:30:30)
# %Z - Equivalent to %:z (e.g. +09:00)
#
# Weekday:
# %A - The full weekday name (``Sunday'')
# %^A uppercased (``SUNDAY'')
# %a - The abbreviated name (``Sun'')
# %^a uppercased (``SUN'')
# %u - Day of the week (Monday is 1, 1..7)
# %w - Day of the week (Sunday is 0, 0..6)
#
# ISO 8601 week-based year and week number:
# The week 1 of YYYY starts with a Monday and includes YYYY-01-04.
# The days in the year before the first week are in the last week of
# the previous year.
# %G - The week-based year
# %g - The last 2 digits of the week-based year (00..99)
# %V - Week number of the week-based year (01..53)
#
# Week number:
# The week 1 of YYYY starts with a Sunday or Monday (according to %U
# or %W). The days in the year before the first week are in week 0.
# %U - Week number of the year. The week starts with Sunday. (00..53)
# %W - Week number of the year. The week starts with Monday. (00..53)
#
# Seconds since the Unix Epoch:
# %s - Number of seconds since 1970-01-01 00:00:00 UTC.
# %Q - Number of milliseconds since 1970-01-01 00:00:00 UTC.
#
# Literal string:
# %n - Newline character (\n)
# %t - Tab character (\t)
# %% - Literal ``%'' character
#
# Combination:
# %c - date and time (%a %b %e %T %Y)
# %D - Date (%m/%d/%y)
# %F - The ISO 8601 date format (%Y-%m-%d)
# %v - VMS date (%e-%b-%Y)
# %x - Same as %D
# %X - Same as %T
# %r - 12-hour time (%I:%M:%S %p)
# %R - 24-hour time (%H:%M)
# %T - 24-hour time (%H:%M:%S)
# %+ - date(1) (%a %b %e %H:%M:%S %Z %Y)
#
# This method is similar to the strftime() function defined in ISO C and POSIX.
# Several directives (%a, %A, %b, %B, %c, %p, %r, %x, %X, %E*, %O* and %Z) are
# locale dependent in the function. However, this method is locale independent.
# So, the result may differ even if the same format string is used in other
# systems such as C. It is good practice to avoid %x and %X because there are
# corresponding locale independent representations, %D and %T.
#
# Examples:
#
# d = DateTime.new(2007,11,19,8,37,48,"-06:00")
# #=> #<DateTime: 2007-11-19T08:37:48-0600 ...>
# d.strftime("Printed on %m/%d/%Y") #=> "Printed on 11/19/2007"
# d.strftime("at %I:%M%p") #=> "at 08:37AM"
#
# Various ISO 8601 formats:
# %Y%m%d => 20071119 Calendar date (basic)
# %F => 2007-11-19 Calendar date (extended)
# %Y-%m => 2007-11 Calendar date, reduced accuracy, specific month
# %Y => 2007 Calendar date, reduced accuracy, specific year
# %C => 20 Calendar date, reduced accuracy, specific century
# %Y%j => 2007323 Ordinal date (basic)
# %Y-%j => 2007-323 Ordinal date (extended)
# %GW%V%u => 2007W471 Week date (basic)
# %G-W%V-%u => 2007-W47-1 Week date (extended)
# %GW%V => 2007W47 Week date, reduced accuracy, specific week (basic)
# %G-W%V => 2007-W47 Week date, reduced accuracy, specific week (extended)
# %H%M%S => 083748 Local time (basic)
# %T => 08:37:48 Local time (extended)
# %H%M => 0837 Local time, reduced accuracy, specific minute (basic)
# %H:%M => 08:37 Local time, reduced accuracy, specific minute (extended)
# %H => 08 Local time, reduced accuracy, specific hour
# %H%M%S,%L => 083748,000 Local time with decimal fraction, comma as decimal sign (basic)
# %T,%L => 08:37:48,000 Local time with decimal fraction, comma as decimal sign (extended)
# %H%M%S.%L => 083748.000 Local time with decimal fraction, full stop as decimal sign (basic)
# %T.%L => 08:37:48.000 Local time with decimal fraction, full stop as decimal sign (extended)
# %H%M%S%z => 083748-0600 Local time and the difference from UTC (basic)
# %T%:z => 08:37:48-06:00 Local time and the difference from UTC (extended)
# %Y%m%dT%H%M%S%z => 20071119T083748-0600 Date and time of day for calendar date (basic)
# %FT%T%:z => 2007-11-19T08:37:48-06:00 Date and time of day for calendar date (extended)
# %Y%jT%H%M%S%z => 2007323T083748-0600 Date and time of day for ordinal date (basic)
# %Y-%jT%T%:z => 2007-323T08:37:48-06:00 Date and time of day for ordinal date (extended)
# %GW%V%uT%H%M%S%z => 2007W471T083748-0600 Date and time of day for week date (basic)
# %G-W%V-%uT%T%:z => 2007-W47-1T08:37:48-06:00 Date and time of day for week date (extended)
# %Y%m%dT%H%M => 20071119T0837 Calendar date and local time (basic)
# %FT%R => 2007-11-19T08:37 Calendar date and local time (extended)
# %Y%jT%H%MZ => 2007323T0837Z Ordinal date and UTC of day (basic)
# %Y-%jT%RZ => 2007-323T08:37Z Ordinal date and UTC of day (extended)
# %GW%V%uT%H%M%z => 2007W471T0837-0600 Week date and local time and difference from UTC (basic)
# %G-W%V-%uT%R%:z => 2007-W47-1T08:37-06:00 Week date and local time and difference from UTC (extended)
#
# See also strftime(3) and ::strptime.
#
def strftime: (?String format) -> String
# Returns a Date object which denotes self.
#
def to_date: () -> Date
# Returns self.
#
def to_datetime: () -> DateTime
# Returns a string in an ISO 8601 format. (This method doesn't use the expanded
# representations.)
#
# DateTime.new(2001,2,3,4,5,6,'-7').to_s
# #=> "2001-02-03T04:05:06-07:00"
#
def to_s: () -> String
# Returns a Time object which denotes self.
#
def to_time: () -> Time
# This method is equivalent to strftime('%FT%T%:z'). The optional argument `n`
# is the number of digits for fractional seconds.
#
# DateTime.parse('2001-02-03T04:05:06.123456789+07:00').iso8601(9)
# #=> "2001-02-03T04:05:06.123456789+07:00"
#
def xmlschema: (?Integer n) -> String
# Returns the timezone.
#
# DateTime.parse('04pm+0730').zone #=> "+07:30"
#
def zone: () -> String
end
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