зеркало из https://github.com/github/ruby.git
309 строки
12 KiB
Ruby
309 строки
12 KiB
Ruby
# Time is an abstraction of dates and times. Time is stored internally as
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# the number of seconds with subsecond since the _Epoch_,
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# 1970-01-01 00:00:00 UTC.
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#
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# The Time class treats GMT
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# (Greenwich Mean Time) and UTC (Coordinated Universal Time) as equivalent.
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# GMT is the older way of referring to these baseline times but persists in
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# the names of calls on POSIX systems.
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#
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# Note: A \Time object uses the resolution available on your system clock.
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#
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# All times may have subsecond. Be aware of this fact when comparing times
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# with each other -- times that are apparently equal when displayed may be
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# different when compared.
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# (Since Ruby 2.7.0, Time#inspect shows subsecond but
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# Time#to_s still doesn't show subsecond.)
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#
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# == Examples
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#
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# All of these examples were done using the EST timezone which is GMT-5.
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#
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# === Creating a New \Time Instance
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#
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# You can create a new instance of Time with Time.new. This will use the
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# current system time. Time.now is an alias for this. You can also
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# pass parts of the time to Time.new such as year, month, minute, etc. When
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# you want to construct a time this way you must pass at least a year. If you
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# pass the year with nothing else time will default to January 1 of that year
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# at 00:00:00 with the current system timezone. Here are some examples:
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#
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# Time.new(2002) #=> 2002-01-01 00:00:00 -0500
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# Time.new(2002, 10) #=> 2002-10-01 00:00:00 -0500
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# Time.new(2002, 10, 31) #=> 2002-10-31 00:00:00 -0500
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#
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# You can pass a UTC offset:
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#
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# Time.new(2002, 10, 31, 2, 2, 2, "+02:00") #=> 2002-10-31 02:02:02 +0200
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#
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# Or a timezone object:
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#
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# zone = timezone("Europe/Athens") # Eastern European Time, UTC+2
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# Time.new(2002, 10, 31, 2, 2, 2, zone) #=> 2002-10-31 02:02:02 +0200
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#
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# You can also use Time.local and Time.utc to infer
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# local and UTC timezones instead of using the current system
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# setting.
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#
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# You can also create a new time using Time.at which takes the number of
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# seconds (with subsecond) since the {Unix
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# Epoch}[https://en.wikipedia.org/wiki/Unix_time].
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#
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# Time.at(628232400) #=> 1989-11-28 00:00:00 -0500
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#
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# === Working with an Instance of \Time
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#
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# Once you have an instance of Time there is a multitude of things you can
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# do with it. Below are some examples. For all of the following examples, we
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# will work on the assumption that you have done the following:
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#
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# t = Time.new(1993, 02, 24, 12, 0, 0, "+09:00")
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#
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# Was that a monday?
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#
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# t.monday? #=> false
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#
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# What year was that again?
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#
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# t.year #=> 1993
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#
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# Was it daylight savings at the time?
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#
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# t.dst? #=> false
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#
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# What's the day a year later?
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#
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# t + (60*60*24*365) #=> 1994-02-24 12:00:00 +0900
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#
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# How many seconds was that since the Unix Epoch?
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#
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# t.to_i #=> 730522800
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#
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# You can also do standard functions like compare two times.
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#
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# t1 = Time.new(2010)
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# t2 = Time.new(2011)
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#
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# t1 == t2 #=> false
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# t1 == t1 #=> true
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# t1 < t2 #=> true
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# t1 > t2 #=> false
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#
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# Time.new(2010,10,31).between?(t1, t2) #=> true
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#
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# == What's Here
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#
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# First, what's elsewhere. \Class \Time:
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#
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# - Inherits from {class Object}[Object.html#class-Object-label-What-27s+Here].
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# - Includes {module Comparable}[Comparable.html#module-Comparable-label-What-27s+Here].
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#
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# Here, class \Time provides methods that are useful for:
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#
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# - {Creating \Time objects}[#class-Time-label-Methods+for+Creating].
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# - {Fetching \Time values}[#class-Time-label-Methods+for+Fetching].
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# - {Querying a \Time object}[#class-Time-label-Methods+for+Querying].
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# - {Comparing \Time objects}[#class-Time-label-Methods+for+Comparing].
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# - {Converting a \Time object}[#class-Time-label-Methods+for+Converting].
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# - {Rounding a \Time}[#class-Time-label-Methods+for+Rounding].
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#
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# === Methods for Creating
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#
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# - ::new: Returns a new time from specified arguments (year, month, etc.),
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# including an optional timezone value.
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# - ::local (aliased as ::mktime): Same as ::new, except the
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# timezone is the local timezone.
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# - ::utc (aliased as ::gm): Same as ::new, except the timezone is UTC.
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# - ::at: Returns a new time based on seconds since epoch.
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# - ::now: Returns a new time based on the current system time.
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# - #+ (plus): Returns a new time increased by the given number of seconds.
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# - {-}[#method-i-2D] (minus): Returns a new time
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# decreased by the given number of seconds.
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#
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# === Methods for Fetching
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#
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# - #year: Returns the year of the time.
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# - #month (aliased as #mon): Returns the month of the time.
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# - #mday (aliased as #day): Returns the day of the month.
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# - #hour: Returns the hours value for the time.
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# - #min: Returns the minutes value for the time.
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# - #sec: Returns the seconds value for the time.
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# - #usec (aliased as #tv_usec): Returns the number of microseconds
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# in the subseconds value of the time.
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# - #nsec (aliased as #tv_nsec: Returns the number of nanoseconds
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# in the subsecond part of the time.
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# - #subsec: Returns the subseconds value for the time.
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# - #wday: Returns the integer weekday value of the time (0 == Sunday).
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# - #yday: Returns the integer yearday value of the time (1 == January 1).
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# - #hash: Returns the integer hash value for the time.
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# - #utc_offset (aliased as #gmt_offset and #gmtoff): Returns the offset
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# in seconds between time and UTC.
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# - #to_f: Returns the float number of seconds since epoch for the time.
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# - #to_i (aliased as #tv_sec): Returns the integer number of seconds since epoch
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# for the time.
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# - #to_r: Returns the Rational number of seconds since epoch for the time.
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# - #zone: Returns a string representation of the timezone of the time.
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#
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# === Methods for Querying
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#
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# - #utc? (aliased as #gmt?): Returns whether the time is UTC.
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# - #dst? (aliased as #isdst): Returns whether the time is DST (daylight saving time).
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# - #sunday?: Returns whether the time is a Sunday.
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# - #monday?: Returns whether the time is a Monday.
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# - #tuesday?: Returns whether the time is a Tuesday.
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# - #wednesday?: Returns whether the time is a Wednesday.
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# - #thursday?: Returns whether the time is a Thursday.
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# - #friday?: Returns whether time is a Friday.
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# - #saturday?: Returns whether the time is a Saturday.
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#
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# === Methods for Comparing
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#
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# - {#<=>}[#method-i-3C-3D-3E]: Compares +self+ to another time.
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# - #eql?: Returns whether the time is equal to another time.
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#
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# === Methods for Converting
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#
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# - #asctime (aliased as #ctime): Returns the time as a string.
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# - #inspect: Returns the time in detail as a string.
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# - #strftime: Returns the time as a string, according to a given format.
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# - #to_a: Returns a 10-element array of values from the time.
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# - #to_s: Returns a string representation of the time.
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# - #getutc (aliased as #getgm): Returns a new time converted to UTC.
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# - #getlocal: Returns a new time converted to local time.
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# - #utc (aliased as #gmtime): Converts time to UTC in place.
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# - #localtime: Converts time to local time in place.
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#
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# === Methods for Rounding
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#
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# - #round:Returns a new time with subseconds rounded.
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# - #ceil: Returns a new time with subseconds raised to a ceiling.
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# - #floor: Returns a new time with subseconds lowered to a floor.
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#
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# == Timezone Argument
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#
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# A timezone argument must have +local_to_utc+ and +utc_to_local+
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# methods, and may have +name+, +abbr+, and +dst?+ methods.
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#
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# The +local_to_utc+ method should convert a Time-like object from
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# the timezone to UTC, and +utc_to_local+ is the opposite. The
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# result also should be a Time or Time-like object (not necessary to
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# be the same class). The #zone of the result is just ignored.
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# Time-like argument to these methods is similar to a Time object in
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# UTC without subsecond; it has attribute readers for the parts,
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# e.g. #year, #month, and so on, and epoch time readers, #to_i. The
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# subsecond attributes are fixed as 0, and #utc_offset, #zone,
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# #isdst, and their aliases are same as a Time object in UTC.
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# Also #to_time, #+, and #- methods are defined.
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#
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# The +name+ method is used for marshaling. If this method is not
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# defined on a timezone object, Time objects using that timezone
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# object can not be dumped by Marshal.
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#
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# The +abbr+ method is used by '%Z' in #strftime.
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#
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# The +dst?+ method is called with a +Time+ value and should return whether
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# the +Time+ value is in daylight savings time in the zone.
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#
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# === Auto Conversion to Timezone
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#
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# At loading marshaled data, a timezone name will be converted to a timezone
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# object by +find_timezone+ class method, if the method is defined.
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#
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# Similarly, that class method will be called when a timezone argument does
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# not have the necessary methods mentioned above.
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class Time
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# Creates a new \Time object from the current system time.
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# This is the same as Time.new without arguments.
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#
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# Time.now # => 2009-06-24 12:39:54 +0900
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# Time.now(in: '+04:00') # => 2009-06-24 07:39:54 +0400
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#
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# Parameter:
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# :include: doc/time/in.rdoc
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def self.now(in: nil)
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new(in: __builtin.arg!(:in))
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end
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# _Time_
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#
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# This form accepts a \Time object +time+
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# and optional keyword argument +in+:
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#
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# Time.at(Time.new) # => 2021-04-26 08:52:31.6023486 -0500
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# Time.at(Time.new, in: '+09:00') # => 2021-04-26 22:52:31.6023486 +0900
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#
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# _Seconds_
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#
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# This form accepts a numeric number of seconds +sec+
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# and optional keyword argument +in+:
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#
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# Time.at(946702800) # => 1999-12-31 23:00:00 -0600
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# Time.at(946702800, in: '+09:00') # => 2000-01-01 14:00:00 +0900
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#
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# <em>Seconds with Subseconds and Units</em>
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#
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# This form accepts an integer number of seconds +sec_i+,
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# a numeric number of milliseconds +msec+,
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# a symbol argument for the subsecond unit type (defaulting to :usec),
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# and an optional keyword argument +in+:
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#
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# Time.at(946702800, 500, :millisecond) # => 1999-12-31 23:00:00.5 -0600
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# Time.at(946702800, 500, :millisecond, in: '+09:00') # => 2000-01-01 14:00:00.5 +0900
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# Time.at(946702800, 500000) # => 1999-12-31 23:00:00.5 -0600
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# Time.at(946702800, 500000, :usec) # => 1999-12-31 23:00:00.5 -0600
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# Time.at(946702800, 500000, :microsecond) # => 1999-12-31 23:00:00.5 -0600
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# Time.at(946702800, 500000, in: '+09:00') # => 2000-01-01 14:00:00.5 +0900
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# Time.at(946702800, 500000, :usec, in: '+09:00') # => 2000-01-01 14:00:00.5 +0900
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# Time.at(946702800, 500000, :microsecond, in: '+09:00') # => 2000-01-01 14:00:00.5 +0900
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# Time.at(946702800, 500000000, :nsec) # => 1999-12-31 23:00:00.5 -0600
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# Time.at(946702800, 500000000, :nanosecond) # => 1999-12-31 23:00:00.5 -0600
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# Time.at(946702800, 500000000, :nsec, in: '+09:00') # => 2000-01-01 14:00:00.5 +0900
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# Time.at(946702800, 500000000, :nanosecond, in: '+09:00') # => 2000-01-01 14:00:00.5 +0900
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#
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# Parameters:
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# :include: doc/time/sec_i.rdoc
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# :include: doc/time/msec.rdoc
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# :include: doc/time/usec.rdoc
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# :include: doc/time/nsec.rdoc
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# :include: doc/time/in.rdoc
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#
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def self.at(time, subsec = (nosubsec = true), unit = (nounit = true), in: nil)
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__builtin.time_s_at(time, subsec, unit, __builtin.arg!(:in), nosubsec, nounit)
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end
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# Returns a new \Time object based the on given arguments.
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#
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# With no positional arguments, returns the value of Time.now:
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#
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# Time.new # => 2021-04-24 17:27:46.0512465 -0500
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#
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# Otherwise, returns a new \Time object based on the given parameters:
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#
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# Time.new(2000) # => 2000-01-01 00:00:00 -0600
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# Time.new(2000, 12, 31, 23, 59, 59.5) # => 2000-12-31 23:59:59.5 -0600
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# Time.new(2000, 12, 31, 23, 59, 59.5, '+09:00') # => 2000-12-31 23:59:59.5 +0900
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#
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# Parameters:
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#
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# :include: doc/time/year.rdoc
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# :include: doc/time/mon-min.rdoc
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# :include: doc/time/sec.rdoc
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# :include: doc/time/zone_and_in.rdoc
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#
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def initialize(year = (now = true), mon = nil, mday = nil, hour = nil, min = nil, sec = nil, zone = nil, in: nil)
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if zone
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if __builtin.arg!(:in)
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raise ArgumentError, "timezone argument given as positional and keyword arguments"
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end
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else
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zone = __builtin.arg!(:in)
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end
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if now
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return __builtin.time_init_now(zone)
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end
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__builtin.time_init_args(year, mon, mday, hour, min, sec, zone)
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end
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end
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