Date

Class representing a date.

See the documentation to the file date.rb for an overview.

Internally, the date is represented as an Astronomical Julian Day Number, ajd. The Day of Calendar Reform, sg, is also stored, for conversions to other date formats. (There is also an of field for a time zone offset, but this is only for the use of the DateTime subclass.)

A new Date object is created using one of the object creation class methods named after the corresponding date format, and the arguments appropriate to that date format; for instance, ::civil (aliased to ::new) with year, month, and day-of-month, or ::ordinal with year and day-of-year. All of these object creation class methods also take the Day of Calendar Reform as an optional argument.

Date objects are immutable once created.

Once a Date has been created, date values can be retrieved for the different date formats supported using instance methods. For instance, mon() gives the Civil month, cwday() gives the Commercial day of the week, and yday() gives the Ordinal day of the year. Date values can be retrieved in any format, regardless of what format was used to create the Date instance.

The Date class includes the Comparable module, allowing date objects to be compared and sorted, ranges of dates to be created, and so forth.

format.rb: Written by Tadayoshi Funaba 1999-2008 $Id: format.rb,v 2.43 2008-01-17 20:16:31+09 tadf Exp $

Constants

ABBR_DAYNAMES: Abbreviated day names, in English.
ABBR_MONTHNAMES: Abbreviated month names, in English.
DAYNAMES: Full names of days of the week, in English. Days of the week count from 0 to 6 (except in the commercial week); a day's numerical representation indexed into this array gives the name of that day.
ENGLAND: The Julian Day Number of the Day of Calendar Reform for England and her Colonies.
GREGORIAN: A constant used to indicate that a Date should always use the Gregorian calendar.
ITALY: The Julian Day Number of the Day of Calendar Reform for Italy and the Catholic countries.
JULIAN: A constant used to indicate that a Date should always use the Julian calendar.
MONTHNAMES: Full month names, in English. Months count from 1 to 12; a month's numerical representation indexed into this array gives the name of that month (hence the first element is nil).

Public Class Methods

_parse(str, comp=true) click to toggle source

 
               # File date/format.rb, line 1030
def self._parse(str, comp=true)
  str = str.dup

  e = Format::Bag.new

  e._comp = comp

  str.gsub!(/[^-+',.\/:@[:alnum:]\[\]]+/, ' ')

  _parse_time(str, e) # || _parse_beat(str, e)
  _parse_day(str, e)

  _parse_eu(str, e)     ||
  _parse_us(str, e)     ||
  _parse_iso(str, e)    ||
  _parse_jis(str, e)    ||
  _parse_vms(str, e)    ||
  _parse_sla(str, e)    ||
  _parse_dot(str, e)    ||
  _parse_iso2(str, e)   ||
  _parse_year(str, e)   ||
  _parse_mon(str, e)    ||
  _parse_mday(str, e)   ||
  _parse_ddd(str, e)

  if str.sub!(/\b(bc\b|bce\b|b\.c\.|b\.c\.e\.)/i, ' ')
    if e.year
      e.year = -e.year + 1
    end
  end

  if str.sub!(/\A\s*(\d{1,2})\s*\z/, ' ')
    if e.hour && !e.mday
      v = $1.to_i
      if (1..31) === v
        e.mday = v
      end
    end
    if e.mday && !e.hour
      v = $1.to_i
      if (0..24) === v
        e.hour = v
      end
    end
  end

  if e._comp
    if e.cwyear
      if e.cwyear >= 0 && e.cwyear <= 99
        e.cwyear += if e.cwyear >= 69
                    then 1900 else 2000 end
      end
    end
    if e.year
      if e.year >= 0 && e.year <= 99
        e.year += if e.year >= 69
                  then 1900 else 2000 end
      end
    end
  end

  e.offset ||= zone_to_diff(e.zone) if e.zone

  e.to_hash
end

_strptime(str, fmt='%F') click to toggle source

 
               # File date/format.rb, line 574
def self._strptime(str, fmt='%F')
  str = str.dup
  e = Format::Bag.new
  return unless _strptime_i(str, fmt, e)

  if e._cent
    if e.cwyear
      e.cwyear += e._cent * 100
    end
    if e.year
      e.  year += e._cent * 100
    end
  end

  if e._merid
    if e.hour
      e.hour %= 12
      e.hour += e._merid
    end
  end

  unless str.empty?
    e.leftover = str
  end

  e.to_hash
end

civil(y=-4712, m=1, d=1, sg=ITALY) click to toggle source

Create a new Date object for the Civil Date specified by year y, month m, and day-of-month d.

m and d can be negative, in which case they count backwards from the end of the year and the end of the month respectively. No wraparound is performed, however, and invalid values cause an ArgumentError to be raised. can be negative

y defaults to -4712, m to 1, and d to 1; this is Julian Day Number day 0.

sg specifies the Day of Calendar Reform.

 
               # File date.rb, line 807
def self.civil(y=-4712, m=1, d=1, sg=ITALY)
  unless jd = _valid_civil?(y, m, d, sg)
    raise ArgumentError, 'invalid date'
  end
  new!(jd_to_ajd(jd, 0, 0), 0, sg)
end

Also aliased as: new

commercial(y=-4712, w=1, d=1, sg=ITALY) click to toggle source

Create a new Date object for the Commercial Date specified by year y, week-of-year w, and day-of-week d.

Monday is day-of-week 1; Sunday is day-of-week 7.

w and d can be negative, in which case they count backwards from the end of the year and the end of the week respectively. No wraparound is performed, however, and invalid values cause an ArgumentError to be raised.

y defaults to -4712, w to 1, and d to 1; this is Julian Day Number day 0.

sg specifies the Day of Calendar Reform.

 
               # File date.rb, line 830
def self.commercial(y=-4712, w=1, d=1, sg=ITALY)
  unless jd = _valid_commercial?(y, w, d, sg)
    raise ArgumentError, 'invalid date'
  end
  new!(jd_to_ajd(jd, 0, 0), 0, sg)
end

gregorian_leap?(y) click to toggle source

Is a year a leap year in the Gregorian calendar?

All years divisible by 4 are leap years in the Gregorian calendar, except for years divisible by 100 and not by 400.

 
               # File date.rb, line 726
def self.gregorian_leap? (y) y % 4 == 0 && y % 100 != 0 || y % 400 == 0 end

Also aliased as: leap?

jd(jd=0, sg=ITALY) click to toggle source

Create a new Date object from a Julian Day Number.

jd is the Julian Day Number; if not specified, it defaults to 0. sg specifies the Day of Calendar Reform.

 
               # File date.rb, line 772
def self.jd(jd=0, sg=ITALY)
  jd = _valid_jd?(jd, sg)
  new!(jd_to_ajd(jd, 0, 0), 0, sg)
end

julian_leap?(y) click to toggle source

Is a year a leap year in the Julian calendar?

All years divisible by 4 are leap years in the Julian calendar.

 
               # File date.rb, line 720
def self.julian_leap? (y) y % 4 == 0 end

leap?(y) click to toggle source

Alias for: gregorian_leap?

new(y=-4712, m=1, d=1, sg=ITALY) click to toggle source

Also aliased as: new!

Alias for: civil

new(ajd=0, of=0, sg=ITALY) click to toggle source

NOTE this is the documentation for the method new!(). If you are reading this as the documentation for new(), that is because rdoc doesn't fully support the aliasing of the initialize() method. new() is in fact an alias for civil(): read the documentation for that method instead.

Create a new Date object.

ajd is the Astronomical Julian Day Number. of is the offset from UTC as a fraction of a day. Both default to 0.

sg specifies the Day of Calendar Reform to use for this Date object.

Using one of the factory methods such as ::civil is generally easier and safer.

 
               # File date.rb, line 1138
def initialize(ajd=0, of=0, sg=ITALY)
  @ajd, @of, @sg = ajd, of, sg
  @__ca__ = {}
end

new!(y=-4712, m=1, d=1, sg=ITALY) click to toggle source

Alias for: new

ordinal(y=-4712, d=1, sg=ITALY) click to toggle source

Create a new Date object from an Ordinal Date, specified by year y and day-of-year d. d can be negative, in which it counts backwards from the end of the year. No year wraparound is performed, however. An invalid value for d results in an ArgumentError being raised.

y defaults to -4712, and d to 1; this is Julian Day Number day 0.

sg specifies the Day of Calendar Reform.

 
               # File date.rb, line 787
def self.ordinal(y=-4712, d=1, sg=ITALY)
  unless jd = _valid_ordinal?(y, d, sg)
    raise ArgumentError, 'invalid date'
  end
  new!(jd_to_ajd(jd, 0, 0), 0, sg)
end

parse(str='-4712-01-01', comp=true, sg=ITALY) click to toggle source

Create a new Date object by parsing from a String, without specifying the format.

str is a String holding a date representation. comp specifies whether to interpret 2-digit years as 19XX (>= 69) or 20XX (< 69); the default is not to. The method will attempt to parse a date from the String using various heuristics; see #_parse in date/format.rb for more details. If parsing fails, an ArgumentError will be raised.

The default str is '-4712-01-01'; this is Julian Day Number day 0.

sg specifies the Day of Calendar Reform.

 
               # File date.rb, line 1064
def self.parse(str='-4712-01-01', comp=true, sg=ITALY)
  elem = _parse(str, comp)
  new_by_frags(elem, sg)
end

strptime(str='-4712-01-01', fmt='%F', sg=ITALY) click to toggle source

Create a new Date object by parsing from a String according to a specified format.

str is a String holding a date representation. fmt is the format that the date is in. See date/format.rb for details on supported formats.

The default str is '-4712-01-01', and the default fmt is '%F', which means Year-Month-Day_of_Month. This gives Julian Day Number day 0.

sg specifies the Day of Calendar Reform.

An ArgumentError will be raised if str cannot be parsed.

 
               # File date.rb, line 1044
def self.strptime(str='-4712-01-01', fmt='%F', sg=ITALY)
  elem = _strptime(str, fmt)
  new_by_frags(elem, sg)
end

today(sg=ITALY) click to toggle source

Create a new Date object representing today.

sg specifies the Day of Calendar Reform.

 
               # File date.rb, line 1795
def self.today(sg=ITALY)
  t = Time.now
  jd = civil_to_jd(t.year, t.mon, t.mday, sg)
  new!(jd_to_ajd(jd, 0, 0), 0, sg)
end

valid_civil?(y, m, d, sg=ITALY) click to toggle source

 
               # File date.rb, line 739
def self.valid_civil? (y, m, d, sg=ITALY)
  !!_valid_civil?(y, m, d, sg)
end

Also aliased as: valid_date?

valid_commercial?(y, w, d, sg=ITALY) click to toggle source

 
               # File date.rb, line 745
def self.valid_commercial? (y, w, d, sg=ITALY)
  !!_valid_commercial?(y, w, d, sg)
end

valid_date?(y, m, d, sg=ITALY) click to toggle source

Alias for: valid_civil?

valid_jd?(jd, sg=ITALY) click to toggle source

 
               # File date.rb, line 731
def self.valid_jd? (jd, sg=ITALY)
  !!_valid_jd?(jd, sg)
end

valid_ordinal?(y, d, sg=ITALY) click to toggle source

 
               # File date.rb, line 735
def self.valid_ordinal? (y, d, sg=ITALY)
  !!_valid_ordinal?(y, d, sg)
end

Public Instance Methods

+(n) click to toggle source

Return a new Date object that is n days later than the current one.

n may be a negative value, in which case the new Date is earlier than the current one; however, #-() might be more intuitive.

If n is not a Numeric, a TypeError will be thrown. In particular, two Dates cannot be added to each other.

 
               # File date.rb, line 1336
def + (n)
  case n
  when Numeric; return self.class.new!(@ajd + n, @of, @sg)
  end
  raise TypeError, 'expected numeric'
end

-(x) click to toggle source

If x is a Numeric value, create a new Date object that is x days earlier than the current one.

If x is a Date, return the number of days between the two dates; or, more precisely, how many days later the current date is than x.

If x is neither Numeric nor a Date, a TypeError is raised.

 
               # File date.rb, line 1351
def - (x)
  case x
  when Numeric; return self.class.new!(@ajd - x, @of, @sg)
  when Date;    return @ajd - x.ajd
  end
  raise TypeError, 'expected numeric or date'
end

<<(n) click to toggle source

Return a new Date object that is n months earlier than the current one.

If the day-of-the-month of the current Date is greater than the last day of the target month, the day-of-the-month of the returned Date will be the last day of the target month.

 
               # File date.rb, line 1420
def << (n) self >> -n end

<=>(other) click to toggle source

Compare this date with another date.

other can also be a Numeric value, in which case it is interpreted as an Astronomical Julian Day Number.

Comparison is by Astronomical Julian Day Number, including fractional days. This means that both the time and the timezone offset are taken into account when comparing two DateTime instances. When comparing a DateTime instance with a Date instance, the time of the latter will be considered as falling on midnight UTC.

 
               # File date.rb, line 1370
def <=> (other)
  case other
  when Numeric; return @ajd <=> other
  when Date;    return @ajd <=> other.ajd
  end
  nil
end

===(other) click to toggle source

The relationship operator for Date.

Compares dates by Julian Day Number. When comparing two DateTime instances, or a DateTime with a Date, the instances will be regarded as equivalent if they fall on the same date in local time.

 
               # File date.rb, line 1384
def === (other)
  case other
  when Numeric; return jd == other
  when Date;    return jd == other.jd
  end
  false
end

>>(n) click to toggle source

Return a new Date object that is n months later than the current one.

If the day-of-the-month of the current Date is greater than the last day of the target month, the day-of-the-month of the returned Date will be the last day of the target month.

 
               # File date.rb, line 1406
def >> (n)
  y, m = (year * 12 + (mon - 1) + n).divmod(12)
  m,   = (m + 1)                    .divmod(1)
  d = mday
  d -= 1 until jd2 = _valid_civil?(y, m, d, @sg)
  self + (jd2 - jd)
end

ajd() click to toggle source

Get the date as an Astronomical Julian Day Number.

 
               # File date.rb, line 1144
def ajd() @ajd end

amjd() click to toggle source

Get the date as an Astronomical Modified Julian Day Number.

 
               # File date.rb, line 1147
def amjd() ajd_to_amjd(@ajd) end

asctime() click to toggle source

alias_method :format, :strftime

 
               # File date/format.rb, line 341
def asctime() strftime('%c') end

Also aliased as: ctime

ctime() click to toggle source

Alias for: asctime

cwday() click to toggle source

Get the commercial day of the week of this date. Monday is commercial day-of-week 1; Sunday is commercial day-of-week 7.

 
               # File date.rb, line 1244
def cwday() commercial[2] end

cweek() click to toggle source

Get the commercial week of the year of this date.

 
               # File date.rb, line 1240
def cweek() commercial[1] end

cwyear() click to toggle source

Get the commercial year of this date. See Commercial Date in the introduction for how this differs from the normal year.

 
               # File date.rb, line 1237
def cwyear() commercial[0] end

day() click to toggle source

Alias for: mday

day_fraction() click to toggle source

Get any fractional day part of the date.

 
               # File date.rb, line 1155
def day_fraction() ajd_to_jd(@ajd, @of)[1] end

downto(min) click to toggle source

Step backward one day at a time until we reach min (inclusive), yielding each date as we go.

 
               # File date.rb, line 1460
def downto(min, &block) # :yield: date
  step(min, -1, &block)
end

england() click to toggle source

Create a copy of this Date object that uses the English/Colonial Day of Calendar Reform.

 
               # File date.rb, line 1306
def england() new_start(self.class::ENGLAND) end

eql?(other) click to toggle source

Is this Date equal to other?

other must both be a Date object, and represent the same date.

 
               # File date.rb, line 1467
def eql? (other) Date === other && self == other end

gregorian() click to toggle source

Create a copy of this Date object that always uses the Gregorian Calendar.

 
               # File date.rb, line 1314
def gregorian() new_start(self.class::GREGORIAN) end

gregorian?() click to toggle source

Is the current date new-style (Gregorian Calendar)?

 
               # File date.rb, line 1274
def gregorian? () !julian? end

hash() click to toggle source

Calculate a hash value for this date.

 
               # File date.rb, line 1470
def hash() @ajd.hash end

hour() click to toggle source

Get the hour of this date.

 
               # File date.rb, line 1213
def hour() time[0] end

inspect() click to toggle source

Return internal object state as a programmer-readable string.

 
               # File date.rb, line 1473
def inspect
  format('#<%s: %s (%s,%s,%s)>', self.class, to_s, @ajd, @of, @sg)
end

iso8601() click to toggle source

 
               # File date/format.rb, line 345
def iso8601() strftime('%F') end

italy() click to toggle source

Create a copy of this Date object that uses the Italian/Catholic Day of Calendar Reform.

 
               # File date.rb, line 1302
def italy() new_start(self.class::ITALY) end

jd() click to toggle source

Get the date as a Julian Day Number.

 
               # File date.rb, line 1152
def jd() ajd_to_jd(@ajd, @of)[0] end

jisx0301() click to toggle source

 
               # File date/format.rb, line 357
def jisx0301
  if jd < 2405160
    iso8601
  else
    case jd
    when 2405160...2419614
      g = 'M%02d' % (year - 1867)
    when 2419614...2424875
      g = 'T%02d' % (year - 1911)
    when 2424875...2447535
      g = 'S%02d' % (year - 1925)
    else
      g = 'H%02d' % (year - 1988)
    end
    g + strftime('.%m.%d')
  end
end

julian() click to toggle source

Create a copy of this Date object that always uses the Julian Calendar.

 
               # File date.rb, line 1310
def julian() new_start(self.class::JULIAN) end

julian?() click to toggle source

Is the current date old-style (Julian Calendar)?

 
               # File date.rb, line 1271
def julian? () jd < @sg end

ld() click to toggle source

Get the date as the number of days since the Day of Calendar Reform (in Italy and the Catholic countries).

 
               # File date.rb, line 1162
def ld() jd_to_ld(jd) end

leap?() click to toggle source

Is this a leap year?

 
               # File date.rb, line 1287
def leap?
  jd_to_civil(civil_to_jd(year, 3, 1, fix_style) - 1,
              fix_style)[-1] == 29
end

marshal_dump() click to toggle source

Dump to Marshal format.

 
               # File date.rb, line 1483
def marshal_dump() [@ajd, @of, @sg] end

marshal_load(a) click to toggle source

Load from Marshal format.

 
               # File date.rb, line 1486
def marshal_load(a)
  @ajd, @of, @sg, = a
  @__ca__ = {}
end

mday() click to toggle source

Get the day-of-the-month of this date.

 
               # File date.rb, line 1195
def mday() civil[2] end

Also aliased as: day

min() click to toggle source

Get the minute of this date.

 
               # File date.rb, line 1216
def min() time[1] end

Also aliased as: minute

minute() click to toggle source

Alias for: min

mjd() click to toggle source

Get the date as a Modified Julian Day Number.

 
               # File date.rb, line 1158
def mjd() jd_to_mjd(jd) end

mon() click to toggle source

Get the month of this date.

January is month 1.

 
               # File date.rb, line 1192
def mon() civil[1] end

Also aliased as: month

month() click to toggle source

Alias for: mon

new_offset(of=0) click to toggle source

 
               # File date.rb, line 1318
def new_offset(of=0)
  if String === of
    of = Rational(zone_to_diff(of) || 0, 86400)
  end
  self.class.new!(@ajd, of, @sg)
end

new_start(sg=self.class::ITALY) click to toggle source

Create a copy of this Date object using a new Day of Calendar Reform.

 
               # File date.rb, line 1298
def new_start(sg=self.class::ITALY) self.class.new!(@ajd, @of, sg) end

next() click to toggle source

Return a new Date one day after this one.

 
               # File date.rb, line 1396
def next() next_day end

Also aliased as: succ

next_day(n=1) click to toggle source

 
               # File date.rb, line 1392
def next_day(n=1) self + n end

next_month(n=1) click to toggle source

 
               # File date.rb, line 1422
def next_month(n=1) self >> n end

next_year(n=1) click to toggle source

 
               # File date.rb, line 1425
def next_year(n=1) self >> n * 12 end

offset() click to toggle source

 
               # File date.rb, line 1316
def offset() @of end

prev_day(n=1) click to toggle source

 
               # File date.rb, line 1393
def prev_day(n=1) self - n end

prev_month(n=1) click to toggle source

 
               # File date.rb, line 1423
def prev_month(n=1) self << n end

prev_year(n=1) click to toggle source

 
               # File date.rb, line 1426
def prev_year(n=1) self << n * 12 end

rfc2822() click to toggle source

 
               # File date/format.rb, line 351
def rfc2822() strftime('%a, %-d %b %Y %T %z') end

Also aliased as: rfc822

rfc3339() click to toggle source

 
               # File date/format.rb, line 347
def rfc3339() iso8601 end

rfc822() click to toggle source

Alias for: rfc2822

sec() click to toggle source

Get the second of this date.

 
               # File date.rb, line 1219
def sec() time[2] end

Also aliased as: second

sec_fraction() click to toggle source

Get the fraction-of-a-second of this date.

 
               # File date.rb, line 1222
def sec_fraction() time[3] end

Also aliased as: second_fraction

second() click to toggle source

Alias for: sec

second_fraction() click to toggle source

Alias for: sec_fraction

start() click to toggle source

When is the Day of Calendar Reform for this Date object?

 
               # File date.rb, line 1295
def start() @sg end

step(limit, step=1) click to toggle source

Step the current date forward step days at a time (or backward, if step is negative) until we reach limit (inclusive), yielding the resultant date at each step.

 
               # File date.rb, line 1434
  def step(limit, step=1) # :yield: date
=begin
    if step.zero?
      raise ArgumentError, "step can't be 0"
    end
=end
    unless block_given?
      return to_enum(:step, limit, step)
    end
    da = self
    op = %w(- <= >=)[step <=> 0]
    while da.__send__(op, limit)
      yield da
      da += step
    end
    self
  end

strftime(fmt='%F') click to toggle source

 
               # File date/format.rb, line 215
def strftime(fmt='%F')
  fmt.gsub(/%([-_0^#]+)?(\d+)?([EO]?(?::{1,3}z|.))/m) do
    f = {}
    m = $&
    s, w, c = $1, $2, $3
    if s
      s.scan(/./) do |k|
        case k
        when '-'; f[:p] = '-'
        when '_'; f[:p] = "\s"
        when '0'; f[:p] = '0'
        when '^'; f[:u] = true
        when '#'; f[:x] = true
        end
      end
    end
    if w
      f[:w] = w.to_i
    end
    case c
    when 'A'; emit_ad(DAYNAMES[wday], 0, f)
    when 'a'; emit_ad(ABBR_DAYNAMES[wday], 0, f)
    when 'B'; emit_ad(MONTHNAMES[mon], 0, f)
    when 'b'; emit_ad(ABBR_MONTHNAMES[mon], 0, f)
    when 'C', 'EC'; emit_sn((year / 100).floor, 2, f)
    when 'c', 'Ec'; emit_a(strftime('%a %b %e %H:%M:%S %Y'), 0, f)
    when 'D'; emit_a(strftime('%m/%d/%y'), 0, f)
    when 'd', 'Od'; emit_n(mday, 2, f)
    when 'e', 'Oe'; emit_a(mday, 2, f)
    when 'F'
      if m == '%F'
        format('%.4d-%02d-%02d', year, mon, mday) # 4p
      else
        emit_a(strftime('%Y-%m-%d'), 0, f)
      end
    when 'G'; emit_sn(cwyear, 4, f)
    when 'g'; emit_n(cwyear % 100, 2, f)
    when 'H', 'OH'; emit_n(hour, 2, f)
    when 'h'; emit_ad(strftime('%b'), 0, f)
    when 'I', 'OI'; emit_n((hour % 12).nonzero? || 12, 2, f)
    when 'j'; emit_n(yday, 3, f)
    when 'k'; emit_a(hour, 2, f)
    when 'L'
      f[:p] = nil
      w = f[:w] || 3
      u = 10**w
      emit_n((sec_fraction * u).floor, w, f)
    when 'l'; emit_a((hour % 12).nonzero? || 12, 2, f)
    when 'M', 'OM'; emit_n(min, 2, f)
    when 'm', 'Om'; emit_n(mon, 2, f)
    when 'N'
      f[:p] = nil
      w = f[:w] || 9
      u = 10**w
      emit_n((sec_fraction * u).floor, w, f)
    when 'n'; emit_a("\n", 0, f)
    when 'P'; emit_ad(strftime('%p').downcase, 0, f)
    when 'p'; emit_au(if hour < 12 then 'AM' else 'PM' end, 0, f)
    when 'Q'
      s = ((ajd - UNIX_EPOCH_IN_AJD) / MILLISECONDS_IN_DAY).round
      emit_sn(s, 1, f)
    when 'R'; emit_a(strftime('%H:%M'), 0, f)
    when 'r'; emit_a(strftime('%I:%M:%S %p'), 0, f)
    when 'S', 'OS'; emit_n(sec, 2, f)
    when 's'
      s = ((ajd - UNIX_EPOCH_IN_AJD) / SECONDS_IN_DAY).round
      emit_sn(s, 1, f)
    when 'T'
      if m == '%T'
        format('%02d:%02d:%02d', hour, min, sec) # 4p
      else
        emit_a(strftime('%H:%M:%S'), 0, f)
      end
    when 't'; emit_a("\t", 0, f)
    when 'U', 'W', 'OU', 'OW'
      emit_n(if c[-1,1] == 'U' then wnum0 else wnum1 end, 2, f)
    when 'u', 'Ou'; emit_n(cwday, 1, f)
    when 'V', 'OV'; emit_n(cweek, 2, f)
    when 'v'; emit_a(strftime('%e-%b-%Y'), 0, f)
    when 'w', 'Ow'; emit_n(wday, 1, f)
    when 'X', 'EX'; emit_a(strftime('%H:%M:%S'), 0, f)
    when 'x', 'Ex'; emit_a(strftime('%m/%d/%y'), 0, f)
    when 'Y', 'EY'; emit_sn(year, 4, f)
    when 'y', 'Ey', 'Oy'; emit_n(year % 100, 2, f)
    when 'Z'; emit_au(strftime('%:z'), 0, f)
    when /\A(:{0,3})z/
      t = $1.size
      sign = if offset < 0 then -1 else +1 end
      fr = offset.abs
      ss = fr.div(SECONDS_IN_DAY) # 4p
      hh, ss = ss.divmod(3600)
      mm, ss = ss.divmod(60)
      if t == 3
        if    ss.nonzero? then t =  2
        elsif mm.nonzero? then t =  1
        else                   t = -1
        end
      end
      case t
      when -1
        tail = []
        sep = ''
      when 0
        f[:w] -= 2 if f[:w]
        tail = ['%02d' % mm]
        sep = ''
      when 1
        f[:w] -= 3 if f[:w]
        tail = ['%02d' % mm]
        sep = ':'
      when 2
        f[:w] -= 6 if f[:w]
        tail = ['%02d' % mm, '%02d' % ss]
        sep = ':'
      end
      ([emit_z(sign * hh, 2, f)] + tail).join(sep)
    when '%'; emit_a('%', 0, f)
    when '+'; emit_a(strftime('%a %b %e %H:%M:%S %Z %Y'), 0, f)
    else
      m
    end
  end
end

succ() click to toggle source

Alias for: next

time_to_day_fraction(h, min, s) click to toggle source

 
               # File date.rb, line 529
def time_to_day_fraction(h, min, s)
  Rational(h * 3600 + min * 60 + s, 86400) # 4p
end

to_date() click to toggle source

 
               # File date.rb, line 1789
def to_date() self end

to_datetime() click to toggle source

 
               # File date.rb, line 1790
def to_datetime() DateTime.new!(jd_to_ajd(jd, 0, 0), @of, @sg) end

to_s() click to toggle source

Return the date as a human-readable string.

The format used is YYYY-MM-DD.

 
               # File date.rb, line 1480
def to_s() format('%.4d-%02d-%02d', year, mon, mday) end

to_time() click to toggle source

 
               # File date.rb, line 1788
def to_time() Time.local(year, mon, mday) end

upto(max) click to toggle source

Step forward one day at a time until we reach max (inclusive), yielding each date as we go.

 
               # File date.rb, line 1454
def upto(max, &block) # :yield: date
  step(max, +1, &block)
end

wday() click to toggle source

Get the week day of this date. Sunday is day-of-week 0; Saturday is day-of-week 6.

 
               # File date.rb, line 1248
def wday() jd_to_wday(jd) end

yday() click to toggle source

Get the day-of-the-year of this date.

January 1 is day-of-the-year 1

 
               # File date.rb, line 1187
def yday() ordinal[1] end

year() click to toggle source

Get the year of this date.

 
               # File date.rb, line 1182
def year() civil[0] end

zone() click to toggle source

 
               # File date.rb, line 1231
def zone() strftime('%:z') end

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