Creates a new Time object with the value given by time, the given number of seconds_with_frac, or seconds and microseconds_with_frac since the Epoch. seconds_with_frac and microseconds_with_frac can be an Integer, Float, Rational, or other Numeric. non-portable feature allows the offset to be negative on some systems.

If a numeric argument is given, the result is in local time.

Time.at(0) #=> 1969年12月31日 18:00:00 -0600
Time.at(Time.at(0)) #=> 1969年12月31日 18:00:00 -0600
Time.at(946702800) #=> 1999年12月31日 23:00:00 -0600
Time.at(-284061600) #=> 1960年12月31日 00:00:00 -0600
Time.at(946684800.2).usec #=> 200000
Time.at(946684800, 123456.789).nsec #=> 123456789

static VALUE
time_s_at(int argc, VALUE *argv, VALUE klass)
{
 VALUE time, t;
 wideval_t timew;
 if (rb_scan_args(argc, argv, "11", &time, &t) == 2) {
 time = num_exact(time);
 t = num_exact(t);
 timew = wadd(rb_time_magnify(v2w(time)), wmulquoll(v2w(t), TIME_SCALE, 1000000));
 t = time_new_timew(klass, timew);
 }
 else if (IsTimeval(time)) {
 struct time_object *tobj, *tobj2;
 GetTimeval(time, tobj);
 t = time_new_timew(klass, tobj->timew);
 GetTimeval(t, tobj2);
 TIME_COPY_GMT(tobj2, tobj);
 }
 else {
 timew = rb_time_magnify(v2w(num_exact(time)));
 t = time_new_timew(klass, timew);
 }
 return t;
}

Creates a Time object based on given values, interpreted as UTC (GMT). The year must be specified. Other values default to the minimum value for that field (and may be nil or omitted). Months may be specified by numbers from 1 to 12, or by the three-letter English month names. Hours are specified on a 24-hour clock (0..23). Raises an ArgumentError if any values are out of range. Will also accept ten arguments in the order output by #to_a.

sec_with_frac and usec_with_frac can have a fractional part.

Time.utc(2000,"jan",1,20,15,1) #=> 2000年01月01日 20:15:01 UTC
Time.gm(2000,"jan",1,20,15,1) #=> 2000年01月01日 20:15:01 UTC

static VALUE
time_s_mkutc(int argc, VALUE *argv, VALUE klass)
{
 return time_utc_or_local(argc, argv, TRUE, klass);
}

Parses date as an HTTP-date defined by RFC 2616 and converts it to a Time object.

ArgumentError is raised if date is not compliant with RFC 2616 or if the Time class cannot represent specified date.

See httpdate for more information on this format.

You must require 'time' to use this method.

# File lib/time.rb, line 482
def httpdate(date)
 if /\A\s*
 (?:Mon|Tue|Wed|Thu|Fri|Sat|Sun),\x20
 (\d{2})\x20
 (Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)\x20
 (\d{4})\x20
 (\d{2}):(\d{2}):(\d{2})\x20
 GMT
 \s*\z/ix =~ date
 self.rfc2822(date)
 elsif /\A\s*
 (?:Monday|Tuesday|Wednesday|Thursday|Friday|Saturday|Sunday),\x20
 (\d\d)-(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)-(\d\d)\x20
 (\d\d):(\d\d):(\d\d)\x20
 GMT
 \s*\z/ix =~ date
 year = 3ドル.to_i
 if year < 50
 year += 2000
 else
 year += 1900
 end
 self.utc(year, 2ドル, 1ドル.to_i, 4ドル.to_i, 5ドル.to_i, 6ドル.to_i)
 elsif /\A\s*
 (?:Mon|Tue|Wed|Thu|Fri|Sat|Sun)\x20
 (Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)\x20
 (\d\d|\x20\d)\x20
 (\d\d):(\d\d):(\d\d)\x20
 (\d{4})
 \s*\z/ix =~ date
 self.utc(6ドル.to_i, MonthValue[1ドル.upcase], 2ドル.to_i,
 3ドル.to_i, 4ドル.to_i, 5ドル.to_i)
 else
 raise ArgumentError.new("not RFC 2616 compliant date: #{date.inspect}")
 end
end

Deserializes JSON string by converting time since epoch to Time

# File ext/json/lib/json/add/time.rb, line 9
def self.json_create(object)
 if usec = object.delete('u') # used to be tv_usec -> tv_nsec
 object['n'] = usec * 1000
 end
 if instance_methods.include?(:tv_nsec)
 at(object['s'], Rational(object['n'], 1000))
 else
 at(object['s'], object['n'] / 1000)
 end
end

Same as ::gm, but interprets the values in the local time zone.

Time.local(2000,"jan",1,20,15,1) #=> 2000年01月01日 20:15:01 -0600

static VALUE
time_s_mktime(int argc, VALUE *argv, VALUE klass)
{
 return time_utc_or_local(argc, argv, FALSE, klass);
}

Same as ::gm, but interprets the values in the local time zone.

Time.local(2000,"jan",1,20,15,1) #=> 2000年01月01日 20:15:01 -0600

static VALUE
time_s_mktime(int argc, VALUE *argv, VALUE klass)
{
 return time_utc_or_local(argc, argv, FALSE, klass);
}

Returns a Time object.

It is initialized to the current system time if no argument is given.

Note: The new object will use the resolution available on your system clock, and may include fractional seconds.

If one or more arguments specified, the time is initialized to the specified time.

sec may have fraction if it is a rational.

utc_offset is the offset from UTC. It can be a string such as "+09:00" or a number of seconds such as 32400.

a = Time.new #=> 2007年11月19日 07:50:02 -0600
b = Time.new #=> 2007年11月19日 07:50:02 -0600
a == b #=> false
"%.6f" % a.to_f #=> "1195480202.282373"
"%.6f" % b.to_f #=> "1195480202.283415"
Time.new(2008,6,21, 13,30,0, "+09:00") #=> 2008年06月21日 13:30:00 +0900
# A trip for RubyConf 2007
t1 = Time.new(2007,11,1,15,25,0, "+09:00") # JST (Narita)
t2 = Time.new(2007,11,1,12, 5,0, "-05:00") # CDT (Minneapolis)
t3 = Time.new(2007,11,1,13,25,0, "-05:00") # CDT (Minneapolis)
t4 = Time.new(2007,11,1,16,53,0, "-04:00") # EDT (Charlotte)
t5 = Time.new(2007,11,5, 9,24,0, "-05:00") # EST (Charlotte)
t6 = Time.new(2007,11,5,11,21,0, "-05:00") # EST (Detroit)
t7 = Time.new(2007,11,5,13,45,0, "-05:00") # EST (Detroit)
t8 = Time.new(2007,11,6,17,10,0, "+09:00") # JST (Narita)
p((t2-t1)/3600.0) #=> 10.666666666666666
p((t4-t3)/3600.0) #=> 2.466666666666667
p((t6-t5)/3600.0) #=> 1.95
p((t8-t7)/3600.0) #=> 13.416666666666666

static VALUE
time_init(int argc, VALUE *argv, VALUE time)
{
 if (argc == 0)
 return time_init_0(time);
 else
 return time_init_1(argc, argv, time);
}

Alias for ::new. Returns a Time object initialized to the current system time.

static VALUE
time_s_now(VALUE klass)
{
 return rb_class_new_instance(0, NULL, klass);
}

Parses date using Date._parse and converts it to a Time object.

If a block is given, the year described in date is converted by the block. For example:

Time.parse(...) {|y| 0 <= y && y < 100 ? (y >= 69 ? y + 1900 : y + 2000) : y}

If the upper components of the given time are broken or missing, they are supplied with those of now. For the lower components, the minimum values (1 or 0) are assumed if broken or missing. For example:

# Suppose it is "Thu Nov 29 14:33:20 2001" now and
# your time zone is EST which is GMT-5.
now = Time.parse("Thu Nov 29 14:33:20 2001")
Time.parse("16:30", now) #=> 2001年11月29日 16:30:00 -0500
Time.parse("7/23", now) #=> 2001年07月23日 00:00:00 -0500
Time.parse("Aug 31", now) #=> 2001年08月31日 00:00:00 -0500
Time.parse("Aug 2000", now) #=> 2000年08月01日 00:00:00 -0500

Since there are numerous conflicts among locally defined time zone abbreviations all over the world, this method is not intended to understand all of them. For example, the abbreviation "CST" is used variously as:

-06:00 in America/Chicago,
-05:00 in America/Havana,
+08:00 in Asia/Harbin,
+09:30 in Australia/Darwin,
+10:30 in Australia/Adelaide,
etc.

Based on this fact, this method only understands the time zone abbreviations described in RFC 822 and the system time zone, in the order named. (i.e. a definition in RFC 822 overrides the system time zone definition.) The system time zone is taken from Time.local(year, 1, 1).zone and Time.local(year, 7, 1).zone. If the extracted time zone abbreviation does not match any of them, it is ignored and the given time is regarded as a local time.

ArgumentError is raised if Date._parse cannot extract information from date or if the Time class cannot represent specified date.

This method can be used as a fail-safe for other parsing methods as:

Time.rfc2822(date) rescue Time.parse(date)
Time.httpdate(date) rescue Time.parse(date)
Time.xmlschema(date) rescue Time.parse(date)

A failure of ::parse should be checked, though.

You must require 'time' to use this method.

# File lib/time.rb, line 323
def parse(date, now=self.now)
 comp = !block_given?
 d = Date._parse(date, comp)
 if !d[:year] && !d[:mon] && !d[:mday] && !d[:hour] && !d[:min] && !d[:sec] && !d[:sec_fraction]
 raise ArgumentError, "no time information in #{date.inspect}"
 end
 year = d[:year]
 year = yield(year) if year && !comp
 make_time(year, d[:mon], d[:mday], d[:hour], d[:min], d[:sec], d[:sec_fraction], d[:zone], now)
end

Parses date as date-time defined by RFC 2822 and converts it to a Time object. The format is identical to the date format defined by RFC 822 and updated by RFC 1123.

ArgumentError is raised if date is not compliant with RFC 2822 or if the Time class cannot represent specified date.

See rfc2822 for more information on this format.

You must require 'time' to use this method.

# File lib/time.rb, line 431
def rfc2822(date)
 if /\A\s*
 (?:(?:Mon|Tue|Wed|Thu|Fri|Sat|Sun)\s*,\s*)?
 (\d{1,2})\s+
 (Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)\s+
 (\d{2,})\s+
 (\d{2})\s*
 :\s*(\d{2})\s*
 (?::\s*(\d{2}))?\s+
 ([+-]\d{4}|
 UT|GMT|EST|EDT|CST|CDT|MST|MDT|PST|PDT|[A-IK-Z])/ix =~ date
 # Since RFC 2822 permit comments, the regexp has no right anchor.
 day = 1ドル.to_i
 mon = MonthValue[2ドル.upcase]
 year = 3ドル.to_i
 hour = 4ドル.to_i
 min = 5ドル.to_i
 sec = 6ドル ? 6ドル.to_i : 0
 zone = 7ドル
 # following year completion is compliant with RFC 2822.
 year = if year < 50
 2000 + year
 elsif year < 1000
 1900 + year
 else
 year
 end
 year, mon, day, hour, min, sec =
 apply_offset(year, mon, day, hour, min, sec, zone_offset(zone))
 t = self.utc(year, mon, day, hour, min, sec)
 t.localtime if !zone_utc?(zone)
 t
 else
 raise ArgumentError.new("not RFC 2822 compliant date: #{date.inspect}")
 end
end

Parses date using Date._strptime and converts it to a Time object.

If a block is given, the year described in date is converted by the block. For example:

Time.strptime(...) {|y| y < 100 ? (y >= 69 ? y + 1900 : y + 2000) : y}

Below is a list of the formating options:

%a

The abbreviated weekday name ("Sun")

%A

The full weekday name ("Sunday")

%b

The abbreviated month name ("Jan")

%B

The full month name ("January")

%c

The preferred local date and time representation

%C

Century (20 in 2009)

%d

Day of the month (01..31)

%D

Date (%m/%d/%y)

%e

Day of the month, blank-padded ( 1..31)

%F

Equivalent to %Y-%m-%d (the ISO 8601 date format)

%h

Equivalent to %b

%H

Hour of the day, 24-hour clock (00..23)

%I

Hour of the day, 12-hour clock (01..12)

%j

Day of the year (001..366)

%k

hour, 24-hour clock, blank-padded ( 0..23)

%l

hour, 12-hour clock, blank-padded ( 0..12)

%L

Millisecond of the second (000..999)

%m

Month of the year (01..12)

%M

Minute of the hour (00..59)

%n

Newline (n)

%N

Fractional seconds digits, default is 9 digits (nanosecond)

%3N

millisecond (3 digits)

%6N

microsecond (6 digits)

%9N

nanosecond (9 digits)

%p

Meridian indicator ("AM" or "PM")

%P

Meridian indicator ("am" or "pm")

%r

time, 12-hour (same as %I:%M:%S %p)

%R

time, 24-hour (%H:%M)

%s

Number of seconds since 1970年01月01日 00:00:00 UTC.

%S

Second of the minute (00..60)

%t

Tab character (t)

%T

time, 24-hour (%H:%M:%S)

%u

Day of the week as a decimal, Monday being 1. (1..7)

%U

Week number of the current year, starting with the first Sunday as the first day of the first week (00..53)

%v

VMS date (%e-%b-%Y)

%V

Week number of year according to ISO 8601 (01..53)

%W

Week number of the current year, starting with the first Monday as the first day of the first week (00..53)

%w

Day of the week (Sunday is 0, 0..6)

%x

Preferred representation for the date alone, no time

%X

Preferred representation for the time alone, no date

%y

Year without a century (00..99)

%Y

Year with century

%z

Time zone as hour offset from UTC (e.g. +0900)

%Z

Time zone name

%%

Literal "%" character

# File lib/time.rb, line 392
def strptime(date, format, now=self.now)
 d = Date._strptime(date, format)
 raise ArgumentError, "invalid strptime format - `#{format}'" unless d
 if seconds = d[:seconds]
 if sec_fraction = d[:sec_fraction]
 usec = sec_fraction * 1000000
 usec *= -1 if seconds < 0
 else
 usec = 0
 end
 if offset = d[:offset]
 Time.at(seconds, usec).localtime(offset)
 else
 Time.at(seconds, usec)
 end
 else
 year = d[:year]
 year = yield(year) if year && block_given?
 make_time(year, d[:mon], d[:mday], d[:hour], d[:min], d[:sec], d[:sec_fraction], d[:zone], now)
 end
end

Creates a Time object based on given values, interpreted as UTC (GMT). The year must be specified. Other values default to the minimum value for that field (and may be nil or omitted). Months may be specified by numbers from 1 to 12, or by the three-letter English month names. Hours are specified on a 24-hour clock (0..23). Raises an ArgumentError if any values are out of range. Will also accept ten arguments in the order output by #to_a.

sec_with_frac and usec_with_frac can have a fractional part.

Time.utc(2000,"jan",1,20,15,1) #=> 2000年01月01日 20:15:01 UTC
Time.gm(2000,"jan",1,20,15,1) #=> 2000年01月01日 20:15:01 UTC

static VALUE
time_s_mkutc(int argc, VALUE *argv, VALUE klass)
{
 return time_utc_or_local(argc, argv, TRUE, klass);
}

This method converts a W3CDTF string date/time format to Time object.

The W3CDTF format is defined here: www.w3.org/TR/NOTE-datetime

Time.w3cdtf('2003年02月15日T13:50:05-05:00')
# => 2003年02月15日 10:50:05 -0800
Time.w3cdtf('2003年02月15日T13:50:05-05:00').class
# => Time

# File lib/rss/rss.rb, line 14
def w3cdtf(date)
 if /\A\s*
 (-?\d+)-(\d\d)-(\d\d)
 (?:T
 (\d\d):(\d\d)(?::(\d\d))?
 (\.\d+)?
 (Z|[+-]\d\d:\d\d)?)?
 \s*\z/ix =~ date and ((5ドル and 8ドル) or (!5ドル and !8ドル))
 datetime = [1ドル.to_i, 2ドル.to_i, 3ドル.to_i, 4ドル.to_i, 5ドル.to_i, 6ドル.to_i]
 usec = 0
 usec = 7ドル.to_f * 1000000 if 7ドル
 zone = 8ドル
 if zone
 off = zone_offset(zone, datetime[0])
 datetime = apply_offset(*(datetime + [off]))
 datetime << usec
 time = Time.utc(*datetime)
 time.localtime unless zone_utc?(zone)
 time
 else
 datetime << usec
 Time.local(*datetime)
 end
 else
 raise ArgumentError.new("invalid date: #{date.inspect}")
 end
end

Parses date as a dateTime defined by the XML Schema and converts it to a Time object. The format is a restricted version of the format defined by ISO 8601.

ArgumentError is raised if date is not compliant with the format or if the Time class cannot represent specified date.

See xmlschema for more information on this format.

You must require 'time' to use this method.

# File lib/time.rb, line 531
def xmlschema(date)
 if /\A\s*
 (-?\d+)-(\d\d)-(\d\d)
 T
 (\d\d):(\d\d):(\d\d)
 (\.\d+)?
 (Z|[+-]\d\d:\d\d)?
 \s*\z/ix =~ date
 year = 1ドル.to_i
 mon = 2ドル.to_i
 day = 3ドル.to_i
 hour = 4ドル.to_i
 min = 5ドル.to_i
 sec = 6ドル.to_i
 usec = 0
 if 7ドル
 usec = Rational(7ドル) * 1000000
 end
 if 8ドル
 zone = 8ドル
 year, mon, day, hour, min, sec =
 apply_offset(year, mon, day, hour, min, sec, zone_offset(zone))
 self.utc(year, mon, day, hour, min, sec, usec)
 else
 self.local(year, mon, day, hour, min, sec, usec)
 end
 else
 raise ArgumentError.new("invalid date: #{date.inspect}")
 end
end

Return the number of seconds the specified time zone differs from UTC.

Numeric time zones that include minutes, such as -10:00 or +1330 will work, as will simpler hour-only time zones like -10 or +13.

Textual time zones listed in ZoneOffset are also supported.

If the time zone does not match any of the above, zone_offset will check if the local time zone (both with and without potential Daylight Saving Time changes being in effect) matches zone. Specifying a value for year will change the year used to find the local time zone.

If zone_offset is unable to determine the offset, nil will be returned.

# File lib/time.rb, line 132
def zone_offset(zone, year=self.now.year)
 off = nil
 zone = zone.upcase
 if /\A([+-])(\d\d):?(\d\d)\z/ =~ zone
 off = (1ドル == '-' ? -1 : 1) * (2ドル.to_i * 60 + 3ドル.to_i) * 60
 elsif /\A[+-]\d\d\z/ =~ zone
 off = zone.to_i * 3600
 elsif ZoneOffset.include?(zone)
 off = ZoneOffset[zone] * 3600
 elsif ((t = self.local(year, 1, 1)).zone.upcase == zone rescue false)
 off = t.utc_offset
 elsif ((t = self.local(year, 7, 1)).zone.upcase == zone rescue false)
 off = t.utc_offset
 end
 off
end

Addition — Adds some number of seconds (possibly fractional) to time and returns that value as a new Time object.

t = Time.now #=> 2007年11月19日 08:22:21 -0600
t + (60 * 60 * 24) #=> 2007年11月20日 08:22:21 -0600

static VALUE
time_plus(VALUE time1, VALUE time2)
{
 struct time_object *tobj;
 GetTimeval(time1, tobj);
 if (IsTimeval(time2)) {
 rb_raise(rb_eTypeError, "time + time?");
 }
 return time_add(tobj, time2, 1);
}

Difference — Returns a new Time object that represents the difference between time and other_time, or subtracts the given number of seconds in numeric from time.

t = Time.now #=> 2007年11月19日 08:23:10 -0600
t2 = t + 2592000 #=> 2007年12月19日 08:23:10 -0600
t2 - t #=> 2592000.0
t2 - 2592000 #=> 2007年11月19日 08:23:10 -0600

static VALUE
time_minus(VALUE time1, VALUE time2)
{
 struct time_object *tobj;
 GetTimeval(time1, tobj);
 if (IsTimeval(time2)) {
 struct time_object *tobj2;
 GetTimeval(time2, tobj2);
 return rb_Float(rb_time_unmagnify_to_float(wsub(tobj->timew, tobj2->timew)));
 }
 return time_add(tobj, time2, -1);
}

Comparison—Compares time with other_time.

-1, 0, +1 or nil depending on whether time is less than, equal to, or greater than other_time.

nil is returned if the two values are incomparable.

t = Time.now #=> 2007年11月19日 08:12:12 -0600
t2 = t + 2592000 #=> 2007年12月19日 08:12:12 -0600
t <=> t2 #=> -1
t2 <=> t #=> 1
t = Time.now #=> 2007年11月19日 08:13:38 -0600
t2 = t + 0.1 #=> 2007年11月19日 08:13:38 -0600
t.nsec #=> 98222999
t2.nsec #=> 198222999
t <=> t2 #=> -1
t2 <=> t #=> 1
t <=> t #=> 0

# File lib/rake/ext/time.rb, line 8
def <=>(other)
 if Rake::EarlyTime === other
 - other.<=>(self)
 else
 rake_original_time_compare(other)
 end
end

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

# File ext/json/lib/json/add/time.rb, line 22
def as_json(*)
 nanoseconds = [ tv_usec * 1000 ]
 respond_to?(:tv_nsec) and nanoseconds << tv_nsec
 nanoseconds = nanoseconds.max
 {
 JSON.create_id => self.class.name,
 's' => tv_sec,
 'n' => nanoseconds,
 }
end

Returns a canonical string representation of time.

Time.now.asctime #=> "Wed Apr 9 08:56:03 2003"

static VALUE
time_asctime(VALUE time)
{
 return strftimev("%a %b %e %T %Y", time, rb_usascii_encoding());
}

Returns a canonical string representation of time.

Time.now.asctime #=> "Wed Apr 9 08:56:03 2003"

static VALUE
time_asctime(VALUE time)
{
 return strftimev("%a %b %e %T %Y", time, rb_usascii_encoding());
}

Returns the day of the month (1..n) for time.

t = Time.now #=> 2007年11月19日 08:27:03 -0600
t.day #=> 19
t.mday #=> 19

static VALUE
time_mday(VALUE time)
{
 struct time_object *tobj;
 GetTimeval(time, tobj);
 MAKE_TM(time, tobj);
 return INT2FIX(tobj->vtm.mday);
}

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

static VALUE
time_isdst(VALUE time)
{
 struct time_object *tobj;
 GetTimeval(time, tobj);
 MAKE_TM(time, tobj);
 return tobj->vtm.isdst ? Qtrue : Qfalse;
}

Returns true if time and other_time are both Time objects with the same seconds and fractional seconds.

static VALUE
time_eql(VALUE time1, VALUE time2)
{
 struct time_object *tobj1, *tobj2;
 GetTimeval(time1, tobj1);
 if (IsTimeval(time2)) {
 GetTimeval(time2, tobj2);
 return rb_equal(w2v(tobj1->timew), w2v(tobj2->timew));
 }
 return Qfalse;
}

Returns true if time represents Friday.

t = Time.local(1987, 12, 18) #=> 1987年12月18日 00:00:00 -0600
t.friday? #=> true

static VALUE
time_friday(VALUE time)
{
 wday_p(5);
}

Returns a new Time object representing time in UTC.

t = Time.local(2000,1,1,20,15,1) #=> 2000年01月01日 20:15:01 -0600
t.gmt? #=> false
y = t.getgm #=> 2000年01月02日 02:15:01 UTC
y.gmt? #=> true
t == y #=> true

static VALUE
time_getgmtime(VALUE time)
{
 return time_gmtime(time_dup(time));
}

Returns a new Time object representing time in local time (using the local time zone in effect for this process).

If utc_offset is given, it is used instead of the local time.

t = Time.utc(2000,1,1,20,15,1) #=> 2000年01月01日 20:15:01 UTC
t.utc? #=> true
l = t.getlocal #=> 2000年01月01日 14:15:01 -0600
l.utc? #=> false
t == l #=> true
j = t.getlocal("+09:00") #=> 2000年01月02日 05:15:01 +0900
j.utc? #=> false
t == j #=> true

static VALUE
time_getlocaltime(int argc, VALUE *argv, VALUE time)
{
 VALUE off;
 rb_scan_args(argc, argv, "01", &off);
 if (!NIL_P(off)) {
 off = utc_offset_arg(off);
 validate_utc_offset(off);
 time = time_dup(time);
 time_set_utc_offset(time, off);
 return time_fixoff(time);
 }
 return time_localtime(time_dup(time));
}

Returns a new Time object representing time in UTC.

t = Time.local(2000,1,1,20,15,1) #=> 2000年01月01日 20:15:01 -0600
t.gmt? #=> false
y = t.getgm #=> 2000年01月02日 02:15:01 UTC
y.gmt? #=> true
t == y #=> true

static VALUE
time_getgmtime(VALUE time)
{
 return time_gmtime(time_dup(time));
}

Returns true if time represents a time in UTC (GMT).

t = Time.now #=> 2007年11月19日 08:15:23 -0600
t.utc? #=> false
t = Time.gm(2000,"jan",1,20,15,1) #=> 2000年01月01日 20:15:01 UTC
t.utc? #=> true
t = Time.now #=> 2007年11月19日 08:16:03 -0600
t.gmt? #=> false
t = Time.gm(2000,1,1,20,15,1) #=> 2000年01月01日 20:15:01 UTC
t.gmt? #=> true

static VALUE
time_utc_p(VALUE time)
{
 struct time_object *tobj;
 GetTimeval(time, tobj);
 if (TIME_UTC_P(tobj)) return Qtrue;
 return Qfalse;
}

Returns the offset in seconds between the timezone of time and UTC.

t = Time.gm(2000,1,1,20,15,1) #=> 2000年01月01日 20:15:01 UTC
t.gmt_offset #=> 0
l = t.getlocal #=> 2000年01月01日 14:15:01 -0600
l.gmt_offset #=> -21600

static VALUE
time_utc_offset(VALUE time)
{
 struct time_object *tobj;
 GetTimeval(time, tobj);
 MAKE_TM(time, tobj);
 if (TIME_UTC_P(tobj)) {
 return INT2FIX(0);
 }
 else {
 return tobj->vtm.utc_offset;
 }
}

Converts time to UTC (GMT), modifying the receiver.

t = Time.now #=> 2007年11月19日 08:18:31 -0600
t.gmt? #=> false
t.gmtime #=> 2007年11月19日 14:18:31 UTC
t.gmt? #=> true
t = Time.now #=> 2007年11月19日 08:18:51 -0600
t.utc? #=> false
t.utc #=> 2007年11月19日 14:18:51 UTC
t.utc? #=> true

static VALUE
time_gmtime(VALUE time)
{
 struct time_object *tobj;
 struct vtm vtm;
 GetTimeval(time, tobj);
 if (TIME_UTC_P(tobj)) {
 if (tobj->tm_got)
 return time;
 }
 else {
 time_modify(time);
 }
 if (!gmtimew(tobj->timew, &vtm))
 rb_raise(rb_eArgError, "gmtime error");
 tobj->vtm = vtm;
 tobj->tm_got = 1;
 TIME_SET_UTC(tobj);
 return time;
}

Returns the offset in seconds between the timezone of time and UTC.

t = Time.gm(2000,1,1,20,15,1) #=> 2000年01月01日 20:15:01 UTC
t.gmt_offset #=> 0
l = t.getlocal #=> 2000年01月01日 14:15:01 -0600
l.gmt_offset #=> -21600

static VALUE
time_utc_offset(VALUE time)
{
 struct time_object *tobj;
 GetTimeval(time, tobj);
 MAKE_TM(time, tobj);
 if (TIME_UTC_P(tobj)) {
 return INT2FIX(0);
 }
 else {
 return tobj->vtm.utc_offset;
 }
}

Returns a hash code for this Time object.

static VALUE
time_hash(VALUE time)
{
 struct time_object *tobj;
 GetTimeval(time, tobj);
 return rb_hash(w2v(tobj->timew));
}

Returns the hour of the day (0..23) for time.

t = Time.now #=> 2007年11月19日 08:26:20 -0600
t.hour #=> 8

static VALUE
time_hour(VALUE time)
{
 struct time_object *tobj;
 GetTimeval(time, tobj);
 MAKE_TM(time, tobj);
 return INT2FIX(tobj->vtm.hour);
}

Returns a string which represents the time as RFC 1123 date of HTTP-date defined by RFC 2616:

day-of-week, DD month-name CCYY hh:mm:ss GMT

Note that the result is always UTC (GMT).

You must require 'time' to use this method.

# File lib/time.rb, line 610
def httpdate
 t = dup.utc
 sprintf('%s, %02d %s %0*d %02d:%02d:%02d GMT',
 RFC2822_DAY_NAME[t.wday],
 t.day, RFC2822_MONTH_NAME[t.mon-1], t.year < 0 ? 5 : 4, t.year,
 t.hour, t.min, t.sec)
end

Returns a string representing time. Equivalent to calling strftime with the appropriate format string.

t = Time.now
t.to_s => "2012年11月10日 18:16:12 +0100"
t.strftime "%Y-%m-%d %H:%M:%S %z" => "2012年11月10日 18:16:12 +0100"
t.utc.to_s => "2012年11月10日 17:16:12 UTC"
t.strftime "%Y-%m-%d %H:%M:%S UTC" => "2012年11月10日 17:16:12 UTC"

static VALUE
time_to_s(VALUE time)
{
 struct time_object *tobj;
 GetTimeval(time, tobj);
 if (TIME_UTC_P(tobj))
 return strftimev("%Y-%m-%d %H:%M:%S UTC", time, rb_usascii_encoding());
 else
 return strftimev("%Y-%m-%d %H:%M:%S %z", time, rb_usascii_encoding());
}

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

static VALUE
time_isdst(VALUE time)
{
 struct time_object *tobj;
 GetTimeval(time, tobj);
 MAKE_TM(time, tobj);
 return tobj->vtm.isdst ? Qtrue : Qfalse;
}

Converts time to local time (using the local time zone in effect for this process) modifying the receiver.

If utc_offset is given, it is used instead of the local time.

t = Time.utc(2000, "jan", 1, 20, 15, 1) #=> 2000年01月01日 20:15:01 UTC
t.utc? #=> true
t.localtime #=> 2000年01月01日 14:15:01 -0600
t.utc? #=> false
t.localtime("+09:00") #=> 2000年01月02日 05:15:01 +0900
t.utc? #=> false

static VALUE
time_localtime_m(int argc, VALUE *argv, VALUE time)
{
 VALUE off;
 rb_scan_args(argc, argv, "01", &off);
 if (!NIL_P(off)) {
 off = utc_offset_arg(off);
 validate_utc_offset(off);
 time_set_utc_offset(time, off);
 return time_fixoff(time);
 }
 return time_localtime(time);
}

Returns the day of the month (1..n) for time.

t = Time.now #=> 2007年11月19日 08:27:03 -0600
t.day #=> 19
t.mday #=> 19

static VALUE
time_mday(VALUE time)
{
 struct time_object *tobj;
 GetTimeval(time, tobj);
 MAKE_TM(time, tobj);
 return INT2FIX(tobj->vtm.mday);
}

Returns the minute of the hour (0..59) for time.

t = Time.now #=> 2007年11月19日 08:25:51 -0600
t.min #=> 25

static VALUE
time_min(VALUE time)
{
 struct time_object *tobj;
 GetTimeval(time, tobj);
 MAKE_TM(time, tobj);
 return INT2FIX(tobj->vtm.min);
}

Returns the month of the year (1..12) for time.

t = Time.now #=> 2007年11月19日 08:27:30 -0600
t.mon #=> 11
t.month #=> 11

static VALUE
time_mon(VALUE time)
{
 struct time_object *tobj;
 GetTimeval(time, tobj);
 MAKE_TM(time, tobj);
 return INT2FIX(tobj->vtm.mon);
}

Returns true if time represents Monday.

t = Time.local(2003, 8, 4) #=> 2003年08月04日 00:00:00 -0500
p t.monday? #=> true

static VALUE
time_monday(VALUE time)
{
 wday_p(1);
}

Returns the month of the year (1..12) for time.

t = Time.now #=> 2007年11月19日 08:27:30 -0600
t.mon #=> 11
t.month #=> 11

static VALUE
time_mon(VALUE time)
{
 struct time_object *tobj;
 GetTimeval(time, tobj);
 MAKE_TM(time, tobj);
 return INT2FIX(tobj->vtm.mon);
}

Returns the number of nanoseconds for time.

t = Time.now #=> 2007年11月17日 15:18:03 +0900
"%10.9f" % t.to_f #=> "1195280283.536151409"
t.nsec #=> 536151406

The lowest digits of to_f and nsec are different because IEEE 754 double is not accurate enough to represent the exact number of nanoseconds since the Epoch.

The more accurate value is returned by nsec.

static VALUE
time_nsec(VALUE time)
{
 struct time_object *tobj;
 GetTimeval(time, tobj);
 return rb_to_int(w2v(wmulquoll(wmod(tobj->timew, WINT2WV(TIME_SCALE)), 1000000000, TIME_SCALE)));
}

Returns a string which represents the time as date-time defined by RFC 2822:

day-of-week, DD month-name CCYY hh:mm:ss zone

where zone is [+-]hhmm.

If self is a UTC time, -0000 is used as zone.

You must require 'time' to use this method.

# File lib/time.rb, line 575
def rfc2822
 sprintf('%s, %02d %s %0*d %02d:%02d:%02d ',
 RFC2822_DAY_NAME[wday],
 day, RFC2822_MONTH_NAME[mon-1], year < 0 ? 5 : 4, year,
 hour, min, sec) +
 if utc?
 '-0000'
 else
 off = utc_offset
 sign = off < 0 ? '-' : '+'
 sprintf('%s%02d%02d', sign, *(off.abs / 60).divmod(60))
 end
end

Rounds sub seconds to a given precision in decimal digits (0 digits by default). It returns a new Time object. ndigits should be zero or positive integer.

require 'time'
t = Time.utc(2010,3,30, 5,43,"25.123456789".to_r)
p t.iso8601(10) #=> "2010年03月30日T05:43:25.1234567890Z"
p t.round.iso8601(10) #=> "2010年03月30日T05:43:25.0000000000Z"
p t.round(0).iso8601(10) #=> "2010年03月30日T05:43:25.0000000000Z"
p t.round(1).iso8601(10) #=> "2010年03月30日T05:43:25.1000000000Z"
p t.round(2).iso8601(10) #=> "2010年03月30日T05:43:25.1200000000Z"
p t.round(3).iso8601(10) #=> "2010年03月30日T05:43:25.1230000000Z"
p t.round(4).iso8601(10) #=> "2010年03月30日T05:43:25.1235000000Z"
p t.round(5).iso8601(10) #=> "2010年03月30日T05:43:25.1234600000Z"
p t.round(6).iso8601(10) #=> "2010年03月30日T05:43:25.1234570000Z"
p t.round(7).iso8601(10) #=> "2010年03月30日T05:43:25.1234568000Z"
p t.round(8).iso8601(10) #=> "2010年03月30日T05:43:25.1234567900Z"
p t.round(9).iso8601(10) #=> "2010年03月30日T05:43:25.1234567890Z"
p t.round(10).iso8601(10) #=> "2010年03月30日T05:43:25.1234567890Z"
t = Time.utc(1999,12,31, 23,59,59)
p((t + 0.4).round.iso8601(3)) #=> "1999年12月31日T23:59:59.000Z"
p((t + 0.49).round.iso8601(3)) #=> "1999年12月31日T23:59:59.000Z"
p((t + 0.5).round.iso8601(3)) #=> "2000年01月01日T00:00:00.000Z"
p((t + 1.4).round.iso8601(3)) #=> "2000年01月01日T00:00:00.000Z"
p((t + 1.49).round.iso8601(3)) #=> "2000年01月01日T00:00:00.000Z"
p((t + 1.5).round.iso8601(3)) #=> "2000年01月01日T00:00:01.000Z"
t = Time.utc(1999,12,31, 23,59,59)
p (t + 0.123456789).round(4).iso8601(6) #=> "1999年12月31日T23:59:59.123500Z"

static VALUE
time_round(int argc, VALUE *argv, VALUE time)
{
 VALUE ndigits, v, a, b, den;
 long nd;
 struct time_object *tobj;
 rb_scan_args(argc, argv, "01", &ndigits);
 if (NIL_P(ndigits))
 ndigits = INT2FIX(0);
 else
 ndigits = rb_to_int(ndigits);
 nd = NUM2LONG(ndigits);
 if (nd < 0)
 rb_raise(rb_eArgError, "negative ndigits given");
 GetTimeval(time, tobj);
 v = w2v(rb_time_unmagnify(tobj->timew));
 a = INT2FIX(1);
 b = INT2FIX(10);
 while (0 < nd) {
 if (nd & 1)
 a = mul(a, b);
 b = mul(b, b);
 nd = nd >> 1;
 }
 den = quo(INT2FIX(1), a);
 v = mod(v, den);
 if (lt(v, quo(den, INT2FIX(2))))
 return time_add(tobj, v, -1);
 else
 return time_add(tobj, sub(den, v), 1);
}

Returns true if time represents Saturday.

t = Time.local(2006, 6, 10) #=> 2006年06月10日 00:00:00 -0500
t.saturday? #=> true

static VALUE
time_saturday(VALUE time)
{
 wday_p(6);
}

Returns the second of the minute (0..60) for time.

Note: Seconds range from zero to 60 to allow the system to inject leap seconds. See en.wikipedia.org/wiki/Leap_second for further details.

t = Time.now #=> 2007年11月19日 08:25:02 -0600
t.sec #=> 2

static VALUE
time_sec(VALUE time)
{
 struct time_object *tobj;
 GetTimeval(time, tobj);
 MAKE_TM(time, tobj);
 return INT2FIX(tobj->vtm.sec);
}

Formats time 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.

The directive consists of a percent (%) character, zero or more flags, optional minimum field width, 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 (rounded down such as 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)
 The digits under millisecond are truncated to not produce 1000.
 %N - Fractional seconds digits, default is 9 digits (nanosecond)
 %3N millisecond (3 digits)
 %6N microsecond (6 digits)
 %9N nanosecond (9 digits)
 %12N picosecond (12 digits)
 %15N femtosecond (15 digits)
 %18N attosecond (18 digits)
 %21N zeptosecond (21 digits)
 %24N yoctosecond (24 digits)
 The digits under the specified length are truncated to avoid
 carry up.
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 - Abbreviated time zone name or similar information.
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 first week 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 first week of YYYY that 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 Epoch:
 %s - Number of seconds since 1970年01月01日 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-%4Y)
 %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)

This method is similar to strftime() function defined in ISO C and POSIX.

While all directives are locale independent since Ruby 1.9, %Z is platform dependent. So, the result may differ even if the same format string is used in other systems such as C.

%z is recommended over %Z. %Z doesn't identify the timezone. For example, "CST" is used at America/Chicago (-06:00), America/Havana (-05:00), Asia/Harbin (+08:00), Australia/Darwin (+09:30) and Australia/Adelaide (+10:30). Also, %Z is highly dependent on the operating system. For example, it may generate a non ASCII string on Japanese Windows. i.e. the result can be different to "JST". So the numeric time zone offset, %z, is recommended.

Examples:

t = Time.new(2007,11,19,8,37,48,"-06:00") #=> 2007年11月19日 08:37:48 -0600
t.strftime("Printed on %m/%d/%Y") #=> "Printed on 11/19/2007"
t.strftime("at %I:%M%p") #=> "at 08:37AM"

Various ISO 8601 formats:

%Y%m%d => 20071119 Calendar date (basic)
%F => 2007年11月19日 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年11月19日T08:37:48-06:00 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年11月19日T08:37 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)

static VALUE
time_strftime(VALUE time, VALUE format)
{
 struct time_object *tobj;
 char buffer[SMALLBUF], *buf = buffer;
 const char *fmt;
 long len;
 rb_encoding *enc;
 VALUE str;
 GetTimeval(time, tobj);
 MAKE_TM(time, tobj);
 StringValue(format);
 if (!rb_enc_str_asciicompat_p(format)) {
 rb_raise(rb_eArgError, "format should have ASCII compatible encoding");
 }
 format = rb_str_new4(format);
 fmt = RSTRING_PTR(format);
 len = RSTRING_LEN(format);
 enc = rb_enc_get(format);
 if (len == 0) {
 rb_warning("strftime called with empty format string");
 }
 else if (memchr(fmt, '0円', len)) {
 /* Ruby string may contain 0円's. */
 const char *p = fmt, *pe = fmt + len;
 str = rb_str_new(0, 0);
 while (p < pe) {
 len = rb_strftime_alloc(&buf, format, p, enc,
 &tobj->vtm, tobj->timew, TIME_UTC_P(tobj));
 rb_str_cat(str, buf, len);
 p += strlen(p);
 if (buf != buffer) {
 xfree(buf);
 buf = buffer;
 }
 for (fmt = p; p < pe && !*p; ++p);
 if (p > fmt) rb_str_cat(str, fmt, p - fmt);
 }
 return str;
 }
 else {
 len = rb_strftime_alloc(&buf, format, RSTRING_PTR(format), enc,
 &tobj->vtm, tobj->timew, TIME_UTC_P(tobj));
 }
 str = rb_enc_str_new(buf, len, enc);
 if (buf != buffer) xfree(buf);
 return str;
}

Returns the fraction for time.

The return value can be a rational number.

t = Time.now #=> 2009年03月26日 22:33:12 +0900
"%10.9f" % t.to_f #=> "1238074392.940563917"
t.subsec #=> (94056401/100000000)

The lowest digits of to_f and subsec are different because IEEE 754 double is not accurate enough to represent the rational number.

The more accurate value is returned by subsec.

static VALUE
time_subsec(VALUE time)
{
 struct time_object *tobj;
 GetTimeval(time, tobj);
 return quo(w2v(wmod(tobj->timew, WINT2FIXWV(TIME_SCALE))), INT2FIX(TIME_SCALE));
}

Returns a new Time object, one second later than time. #succ is obsolete since 1.9.2 for time is not a discrete value.

t = Time.now #=> 2007年11月19日 08:23:57 -0600
t.succ #=> 2007年11月19日 08:23:58 -0600

Use instead time + 1

t + 1 #=> 2007年11月19日 08:23:58 -0600

VALUE
rb_time_succ(VALUE time)
{
 struct time_object *tobj;
 struct time_object *tobj2;
 rb_warn("Time#succ is obsolete; use time + 1");
 GetTimeval(time, tobj);
 time = time_new_timew(rb_cTime, wadd(tobj->timew, WINT2FIXWV(TIME_SCALE)));
 GetTimeval(time, tobj2);
 TIME_COPY_GMT(tobj2, tobj);
 return time;
}

Returns true if time represents Sunday.

t = Time.local(1990, 4, 1) #=> 1990年04月01日 00:00:00 -0600
t.sunday? #=> true

static VALUE
time_sunday(VALUE time)
{
 wday_p(0);
}

Returns true if time represents Thursday.

t = Time.local(1995, 12, 21) #=> 1995年12月21日 00:00:00 -0600
p t.thursday? #=> true

static VALUE
time_thursday(VALUE time)
{
 wday_p(4);
}

Returns a ten-element array of values for time:

[sec, min, hour, day, month, year, wday, yday, isdst, zone]

See the individual methods for an explanation of the valid ranges of each value. The ten elements can be passed directly to ::utc or ::local to create a new Time object.

t = Time.now #=> 2007年11月19日 08:36:01 -0600
now = t.to_a #=> [1, 36, 8, 19, 11, 2007, 1, 323, false, "CST"]

static VALUE
time_to_a(VALUE time)
{
 struct time_object *tobj;
 GetTimeval(time, tobj);
 MAKE_TM(time, tobj);
 return rb_ary_new3(10,
 INT2FIX(tobj->vtm.sec),
 INT2FIX(tobj->vtm.min),
 INT2FIX(tobj->vtm.hour),
 INT2FIX(tobj->vtm.mday),
 INT2FIX(tobj->vtm.mon),
 tobj->vtm.year,
 INT2FIX(tobj->vtm.wday),
 INT2FIX(tobj->vtm.yday),
 tobj->vtm.isdst?Qtrue:Qfalse,
 time_zone(time));
}

Returns a Date object which denotes self.

static VALUE
time_to_date(VALUE self)
{
 VALUE y, nth, ret;
 int ry, m, d;
 y = f_year(self);
 m = FIX2INT(f_mon(self));
 d = FIX2INT(f_mday(self));
 decode_year(y, -1, &nth, &ry);
 ret = d_simple_new_internal(cDate,
 nth, 0,
 GREGORIAN,
 ry, m, d,
 HAVE_CIVIL);
 {
 get_d1(ret);
 set_sg(dat, DEFAULT_SG);
 }
 return ret;
}

Returns a DateTime object which denotes self.

static VALUE
time_to_datetime(VALUE self)
{
 VALUE y, sf, nth, ret;
 int ry, m, d, h, min, s, of;
 y = f_year(self);
 m = FIX2INT(f_mon(self));
 d = FIX2INT(f_mday(self));
 h = FIX2INT(f_hour(self));
 min = FIX2INT(f_min(self));
 s = FIX2INT(f_sec(self));
 if (s == 60)
 s = 59;
 sf = sec_to_ns(f_subsec(self));
 of = FIX2INT(f_utc_offset(self));
 decode_year(y, -1, &nth, &ry);
 ret = d_complex_new_internal(cDateTime,
 nth, 0,
 0, sf,
 of, DEFAULT_SG,
 ry, m, d,
 h, min, s,
 HAVE_CIVIL | HAVE_TIME);
 {
 get_d1(ret);
 set_sg(dat, DEFAULT_SG);
 }
 return ret;
}

Returns the value of time as a floating point number of seconds since the Epoch.

t = Time.now
"%10.5f" % t.to_f #=> "1270968744.77658"
t.to_i #=> 1270968744

Note that IEEE 754 double is not accurate enough to represent the number of nanoseconds since the Epoch.

static VALUE
time_to_f(VALUE time)
{
 struct time_object *tobj;
 GetTimeval(time, tobj);
 return rb_Float(rb_time_unmagnify_to_float(tobj->timew));
}

Returns the value of time as an integer number of seconds since the Epoch.

t = Time.now
"%10.5f" % t.to_f #=> "1270968656.89607"
t.to_i #=> 1270968656

static VALUE
time_to_i(VALUE time)
{
 struct time_object *tobj;
 GetTimeval(time, tobj);
 return w2v(wdiv(tobj->timew, WINT2FIXWV(TIME_SCALE)));
}

Stores class name (Time) with number of seconds since epoch and number of microseconds for Time as JSON string

# File ext/json/lib/json/add/time.rb, line 35
def to_json(*args)
 as_json.to_json(*args)
end

Returns the value of time as a rational number of seconds since the Epoch.

t = Time.now
p t.to_r #=> (1270968792716287611/1000000000)

This methods is intended to be used to get an accurate value representing the nanoseconds since the Epoch. You can use this method to convert time to another Epoch.

static VALUE
time_to_r(VALUE time)
{
 struct time_object *tobj;
 VALUE v;
 GetTimeval(time, tobj);
 v = w2v(rb_time_unmagnify(tobj->timew));
 if (!RB_TYPE_P(v, T_RATIONAL)) {
 v = rb_Rational1(v);
 }
 return v;
}

Returns a string representing time. Equivalent to calling strftime with the appropriate format string.

t = Time.now
t.to_s => "2012年11月10日 18:16:12 +0100"
t.strftime "%Y-%m-%d %H:%M:%S %z" => "2012年11月10日 18:16:12 +0100"
t.utc.to_s => "2012年11月10日 17:16:12 UTC"
t.strftime "%Y-%m-%d %H:%M:%S UTC" => "2012年11月10日 17:16:12 UTC"

static VALUE
time_to_s(VALUE time)
{
 struct time_object *tobj;
 GetTimeval(time, tobj);
 if (TIME_UTC_P(tobj))
 return strftimev("%Y-%m-%d %H:%M:%S UTC", time, rb_usascii_encoding());
 else
 return strftimev("%Y-%m-%d %H:%M:%S %z", time, rb_usascii_encoding());
}

Returns a copy of self as local mode.

static VALUE
time_to_time(VALUE self)
{
 return f_getlocal(self);
}

Returns true if time represents Tuesday.

t = Time.local(1991, 2, 19) #=> 1991年02月19日 00:00:00 -0600
p t.tuesday? #=> true

static VALUE
time_tuesday(VALUE time)
{
 wday_p(2);
}

Returns the number of nanoseconds for time.

t = Time.now #=> 2007年11月17日 15:18:03 +0900
"%10.9f" % t.to_f #=> "1195280283.536151409"
t.nsec #=> 536151406

The lowest digits of to_f and nsec are different because IEEE 754 double is not accurate enough to represent the exact number of nanoseconds since the Epoch.

The more accurate value is returned by nsec.

static VALUE
time_nsec(VALUE time)
{
 struct time_object *tobj;
 GetTimeval(time, tobj);
 return rb_to_int(w2v(wmulquoll(wmod(tobj->timew, WINT2WV(TIME_SCALE)), 1000000000, TIME_SCALE)));
}

Returns the value of time as an integer number of seconds since the Epoch.

t = Time.now
"%10.5f" % t.to_f #=> "1270968656.89607"
t.to_i #=> 1270968656

static VALUE
time_to_i(VALUE time)
{
 struct time_object *tobj;
 GetTimeval(time, tobj);
 return w2v(wdiv(tobj->timew, WINT2FIXWV(TIME_SCALE)));
}

Returns the number of microseconds for time.

t = Time.now #=> 2007年11月19日 08:03:26 -0600
"%10.6f" % t.to_f #=> "1195481006.775195"
t.usec #=> 775195

static VALUE
time_usec(VALUE time)
{
 struct time_object *tobj;
 wideval_t w, q, r;
 GetTimeval(time, tobj);
 w = wmod(tobj->timew, WINT2WV(TIME_SCALE));
 wmuldivmod(w, WINT2FIXWV(1000000), WINT2FIXWV(TIME_SCALE), &q, &r);
 return rb_to_int(w2v(q));
}

Returns the number of microseconds for time.

t = Time.now #=> 2007年11月19日 08:03:26 -0600
"%10.6f" % t.to_f #=> "1195481006.775195"
t.usec #=> 775195

static VALUE
time_usec(VALUE time)
{
 struct time_object *tobj;
 wideval_t w, q, r;
 GetTimeval(time, tobj);
 w = wmod(tobj->timew, WINT2WV(TIME_SCALE));
 wmuldivmod(w, WINT2FIXWV(1000000), WINT2FIXWV(TIME_SCALE), &q, &r);
 return rb_to_int(w2v(q));
}

Converts time to UTC (GMT), modifying the receiver.

t = Time.now #=> 2007年11月19日 08:18:31 -0600
t.gmt? #=> false
t.gmtime #=> 2007年11月19日 14:18:31 UTC
t.gmt? #=> true
t = Time.now #=> 2007年11月19日 08:18:51 -0600
t.utc? #=> false
t.utc #=> 2007年11月19日 14:18:51 UTC
t.utc? #=> true

static VALUE
time_gmtime(VALUE time)
{
 struct time_object *tobj;
 struct vtm vtm;
 GetTimeval(time, tobj);
 if (TIME_UTC_P(tobj)) {
 if (tobj->tm_got)
 return time;
 }
 else {
 time_modify(time);
 }
 if (!gmtimew(tobj->timew, &vtm))
 rb_raise(rb_eArgError, "gmtime error");
 tobj->vtm = vtm;
 tobj->tm_got = 1;
 TIME_SET_UTC(tobj);
 return time;
}

Returns true if time represents a time in UTC (GMT).

t = Time.now #=> 2007年11月19日 08:15:23 -0600
t.utc? #=> false
t = Time.gm(2000,"jan",1,20,15,1) #=> 2000年01月01日 20:15:01 UTC
t.utc? #=> true
t = Time.now #=> 2007年11月19日 08:16:03 -0600
t.gmt? #=> false
t = Time.gm(2000,1,1,20,15,1) #=> 2000年01月01日 20:15:01 UTC
t.gmt? #=> true

static VALUE
time_utc_p(VALUE time)
{
 struct time_object *tobj;
 GetTimeval(time, tobj);
 if (TIME_UTC_P(tobj)) return Qtrue;
 return Qfalse;
}

Returns the offset in seconds between the timezone of time and UTC.

t = Time.gm(2000,1,1,20,15,1) #=> 2000年01月01日 20:15:01 UTC
t.gmt_offset #=> 0
l = t.getlocal #=> 2000年01月01日 14:15:01 -0600
l.gmt_offset #=> -21600

static VALUE
time_utc_offset(VALUE time)
{
 struct time_object *tobj;
 GetTimeval(time, tobj);
 MAKE_TM(time, tobj);
 if (TIME_UTC_P(tobj)) {
 return INT2FIX(0);
 }
 else {
 return tobj->vtm.utc_offset;
 }
}

This method converts a Time object to a String. The String contains the time in W3CDTF date/time format.

The W3CDTF format is defined here: www.w3.org/TR/NOTE-datetime

Time.now.w3cdtf
# => "2013年08月26日T14:12:10.817124-07:00"

# File lib/rss/rss.rb, line 52
def w3cdtf
 if usec.zero?
 fraction_digits = 0
 else
 fraction_digits = strftime('%6N').index(/0*\z/)
 end
 xmlschema(fraction_digits)
end

Returns an integer representing the day of the week, 0..6, with Sunday == 0.

t = Time.now #=> 2007年11月20日 02:35:35 -0600
t.wday #=> 2
t.sunday? #=> false
t.monday? #=> false
t.tuesday? #=> true
t.wednesday? #=> false
t.thursday? #=> false
t.friday? #=> false
t.saturday? #=> false

static VALUE
time_wday(VALUE time)
{
 struct time_object *tobj;
 GetTimeval(time, tobj);
 MAKE_TM(time, tobj);
 return INT2FIX(tobj->vtm.wday);
}

Returns true if time represents Wednesday.

t = Time.local(1993, 2, 24) #=> 1993年02月24日 00:00:00 -0600
p t.wednesday? #=> true

static VALUE
time_wednesday(VALUE time)
{
 wday_p(3);
}

Returns a string which represents the time as a dateTime defined by XML Schema:

CCYY-MM-DDThh:mm:ssTZD
CCYY-MM-DDThh:mm:ss.sssTZD

where TZD is Z or [+-]hh:mm.

If self is a UTC time, Z is used as TZD. [+-]hh:mm is used otherwise.

fractional_digits specifies a number of digits to use for fractional seconds. Its default value is 0.

You must require 'time' to use this method.

# File lib/time.rb, line 634
def xmlschema(fraction_digits=0)
 fraction_digits = fraction_digits.to_i
 s = strftime("%FT%T")
 if fraction_digits > 0
 s << strftime(".%#{fraction_digits}N")
 end
 s << (utc? ? 'Z' : strftime("%:z"))
end

Returns an integer representing the day of the year, 1..366.

t = Time.now #=> 2007年11月19日 08:32:31 -0600
t.yday #=> 323

static VALUE
time_yday(VALUE time)
{
 struct time_object *tobj;
 GetTimeval(time, tobj);
 MAKE_TM(time, tobj);
 return INT2FIX(tobj->vtm.yday);
}

Returns the year for time (including the century).

t = Time.now #=> 2007年11月19日 08:27:51 -0600
t.year #=> 2007

static VALUE
time_year(VALUE time)
{
 struct time_object *tobj;
 GetTimeval(time, tobj);
 MAKE_TM(time, tobj);
 return tobj->vtm.year;
}

Returns the name of the time zone used for time. As of Ruby 1.8, returns "UTC'' rather than "GMT'' for UTC times.

t = Time.gm(2000, "jan", 1, 20, 15, 1)
t.zone #=> "UTC"
t = Time.local(2000, "jan", 1, 20, 15, 1)
t.zone #=> "CST"

static VALUE
time_zone(VALUE time)
{
 struct time_object *tobj;
 GetTimeval(time, tobj);
 MAKE_TM(time, tobj);
 if (TIME_UTC_P(tobj)) {
 return rb_obj_untaint(rb_locale_str_new_cstr("UTC"));
 }
 if (tobj->vtm.zone == NULL)
 return Qnil;
 return rb_obj_untaint(rb_locale_str_new_cstr(tobj->vtm.zone));
}