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Object
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.
Abbreviated day names, in English.
Abbreviated month names, in English.
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.
The Julian Day Number of the Day of Calendar Reform for England and her Colonies.
A constant used to indicate that a Date should always use the Gregorian calendar.
The Julian Day Number of the Day of Calendar Reform for Italy and the Catholic countries.
A constant used to indicate that a Date should always use the Julian calendar.
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).
Load from Marshal format.
# File date.rb, line 1391 def self._load(str) a = Marshal.load(str) if a.size == 2 ajd, sg = a of = 0 ajd -= 1.to_r/2 else ajd, of, sg = a end new!(ajd, of, sg) end
# File date/format.rb, line 1054 def self._parse(str, comp=false) str = str.dup e = Format::Bag.new e._comp = comp str.gsub!(/[^-+',.\/:@[:alnum:]\[\]\x80-\xff]+/n, ' ') _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\.)/in, ' ') if e.year e.year = -e.year + 1 end end if str.sub!(/\A\s*(\d{1,2})\s*\z/n, ' ') 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
# File date/format.rb, line 598 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
Convert an Astronomical Julian Day Number to an Astronomical Modified Julian Day Number.
# File date.rb, line 538 def self.ajd_to_amjd(ajd) ajd - MJD_EPOCH_IN_AJD end
Convert an Astronomical Julian Day Number to a (civil) Julian Day Number.
ajd
is the Astronomical Julian Day Number to convert.
of
is the offset from UTC as a fraction of a day (defaults to
0).
Returns the (civil) Julian Day Number as [day_number, fraction] where
fraction
is always 1/2.
# File date.rb, line 492 def self.ajd_to_jd(ajd, of=0) (ajd + of + HALF_DAYS_IN_DAY).divmod(1) end
Convert an Astronomical Modified Julian Day Number to an Astronomical Julian Day Number.
# File date.rb, line 534 def self.amjd_to_ajd(amjd) amjd + MJD_EPOCH_IN_AJD end
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 750 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
Convert a Civil Date to a Julian Day Number.
y
, m
, and d
are the year, month, and
day of the month. sg
specifies the Day of Calendar Reform.
Returns the corresponding Julian Day Number.
# File date.rb, line 396 def self.civil_to_jd(y, m, d, sg=GREGORIAN) if m <= 2 y -= 1 m += 12 end a = (y / 100.0).floor b = 2 - a + (a / 4.0).floor jd = (365.25 * (y + 4716)).floor + (30.6001 * (m + 1)).floor + d + b - 1524 if julian?(jd, sg) jd -= b end jd end
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 1582, w
to 41, and d
to 5, the Day of Calendar Reform for Italy and the Catholic countries.
sg
specifies the Day of Calendar Reform.
# File date.rb, line 773 def self.commercial(y=1582, w=41, d=5, 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
Convert a Commercial Date to a Julian Day Number.
y
, w
, and d
are the (commercial)
year, week of the year, and day of the week of the Commercial Date to convert. sg
specifies the Day of
Calendar Reform.
# File date.rb, line 445 def self.commercial_to_jd(y, w, d, ns=GREGORIAN) jd = civil_to_jd(y, 1, 4, ns) (jd - (((jd - 1) + 1) % 7)) + 7 * (w - 1) + (d - 1) end
Convert a fractional day fr
to [hours, minutes, seconds,
fraction_of_a_second]
# File date.rb, line 507 def self.day_fraction_to_time(fr) ss, fr = fr.divmod(SECONDS_IN_DAY) # 4p h, ss = ss.divmod(3600) min, s = ss.divmod(60) return h, min, s, fr end
Does a given Julian Day Number fall inside the new-style (Gregorian) calendar?
The reverse of self.os? See the documentation for that method for more details.
# File date.rb, line 358 def self.gregorian? (jd, sg) !julian?(jd, sg) end
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 570 def self.gregorian_leap? (y) y % 4 == 0 && y % 100 != 0 || y % 400 == 0 end
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 715 def self.jd(jd=0, sg=ITALY) jd = valid_jd?(jd, sg) new!(jd_to_ajd(jd, 0, 0), 0, sg) end
Convert a (civil) Julian Day Number to an Astronomical Julian Day Number.
jd
is the Julian Day Number to convert, and fr
is
a fractional day. of
is the offset from UTC as a fraction of a
day (defaults to 0).
Returns the Astronomical Julian Day Number as a single numeric value.
# File date.rb, line 503 def self.jd_to_ajd(jd, fr, of=0) jd + fr - of - HALF_DAYS_IN_DAY end
Convert a Julian Day Number to a Civil Date.
jd
is the Julian Day Number. sg
specifies the Day
of Calendar Reform.
Returns the corresponding [year, month, day_of_month] as a three-element array.
# File date.rb, line 418 def self.jd_to_civil(jd, sg=GREGORIAN) if julian?(jd, sg) a = jd else x = ((jd - 1867216.25) / 36524.25).floor a = jd + 1 + x - (x / 4.0).floor end b = a + 1524 c = ((b - 122.1) / 365.25).floor d = (365.25 * c).floor e = ((b - d) / 30.6001).floor dom = b - d - (30.6001 * e).floor if e <= 13 m = e - 1 y = c - 4716 else m = e - 13 y = c - 4715 end return y, m, dom end
Convert a Julian Day Number to a Commercial Date
jd
is the Julian Day Number to convert. sg
specifies the Day of Calendar Reform.
Returns the corresponding Commercial Date as
# File date.rb, line 459 def self.jd_to_commercial(jd, sg=GREGORIAN) ns = fix_style(jd, sg) a = jd_to_civil(jd - 3, ns)[0] y = if jd >= commercial_to_jd(a + 1, 1, 1, ns) then a + 1 else a end w = 1 + ((jd - commercial_to_jd(y, 1, 1, ns)) / 7).floor d = (jd + 1) % 7 d = 7 if d == 0 return y, w, d end
Convert a Julian Day Number to the number of days since the adoption of the Gregorian Calendar (in Italy).
# File date.rb, line 554 def self.jd_to_ld(jd) jd - LD_EPOCH_IN_CJD end
Convert a Julian Day Number to a Modified Julian Day Number.
# File date.rb, line 546 def self.jd_to_mjd(jd) jd - MJD_EPOCH_IN_CJD end
Convert a Julian Day Number to an Ordinal Date.
jd
is the Julian Day Number to convert. sg
specifies the Day of Calendar Reform.
Returns the corresponding Ordinal Date as
# File date.rb, line 385 def self.jd_to_ordinal(jd, sg=GREGORIAN) y = jd_to_civil(jd, sg)[0] doy = jd - civil_to_jd(y - 1, 12, 31, fix_style(jd, sg)) return y, doy end
Convert a Julian Day Number to the day of the week.
Sunday is day-of-week 0; Saturday is day-of-week 6.
# File date.rb, line 559 def self.jd_to_wday(jd) (jd + 1) % 7 end
Does a given Julian Day Number fall inside the old-style (Julian) calendar?
jd
is the Julian Day Number in question. sg
may
be Date::GREGORIAN, in which case the
answer is false; it may be Date::JULIAN, in
which case the answer is true; or it may a number representing the Day of
Calendar Reform. Date::ENGLAND and Date::ITALY are two possible such days.
# File date.rb, line 340 def self.julian? (jd, sg) case sg when Numeric jd < sg else if $VERBOSE warn("#{caller.shift.sub(/:in .*/, '')}: " \ "warning: do not use non-numerical object as julian day number anymore") end not sg end end
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 564 def self.julian_leap? (y) y % 4 == 0 end
Convert a count of the number of days since the adoption of the Gregorian Calendar (in Italy) to a Julian Day Number.
# File date.rb, line 550 def self.ld_to_jd(ld) ld + LD_EPOCH_IN_CJD end
Convert a Modified Julian Day Number to a Julian Day Number.
# File date.rb, line 542 def self.mjd_to_jd(mjd) mjd + MJD_EPOCH_IN_CJD end
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 1040 def initialize(ajd=0, of=0, sg=ITALY) @ajd, @of, @sg = ajd, of, sg end
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 730 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
Convert an Ordinal Date to a Julian Day Number.
y
and d
are the year and day-of-year to convert.
sg
specifies the Day of Calendar Reform.
Returns the corresponding Julian Day Number.
# File date.rb, line 374 def self.ordinal_to_jd(y, d, sg=GREGORIAN) civil_to_jd(y, 1, d, sg) end
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 998 def self.parse(str='-4712-01-01', comp=false, sg=ITALY) elem = _parse(str, comp) new_by_frags(elem, sg) end
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 978 def self.strptime(str='-4712-01-01', fmt='%F', sg=ITALY) elem = _strptime(str, fmt) new_by_frags(elem, sg) end
# File date.rb, line 519 def self.time_to_day_fraction(h, min, s) Rational(h * 3600 + min * 60 + s, 86400) # 4p end
Create a new Date object representing today.
sg
specifies the Day of Calendar Reform.
# File date.rb, line 1666 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
Do year y
, month m
, and day-of-month
d
make a valid Civil Date? Returns
the corresponding Julian Day Number if they do, nil if they don't.
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. A date falling in the period skipped in the Day
of Calendar Reform adjustment is not valid.
sg
specifies the Day of Calendar Reform.
# File date.rb, line 620 def self.valid_civil? (y, m, d, sg=ITALY) if m < 0 m += 13 end if d < 0 ny, nm = (y * 12 + m).divmod(12) nm, = (nm + 1).divmod(1) jd = civil_to_jd(ny, nm, d + 1, sg) ns = fix_style(jd, sg) return unless [y, m] == jd_to_civil(jd, sg)[0..1] return unless [ny, nm, 1] == jd_to_civil(jd - d, ns) else jd = civil_to_jd(y, m, d, sg) return unless [y, m, d] == jd_to_civil(jd, sg) end jd end
Do year y
, week-of-year w
, and day-of-week
d
make a valid Commercial Date?
Returns the corresponding Julian Day Number if they do, nil if they
don't.
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. A date falling in the period skipped in the Day
of Calendar Reform adjustment is not valid.
sg
specifies the Day of Calendar Reform.
# File date.rb, line 654 def self.valid_commercial? (y, w, d, sg=ITALY) if d < 0 d += 8 end if w < 0 ny, nw, nd = jd_to_commercial(commercial_to_jd(y + 1, 1, 1) + w * 7) return unless ny == y w = nw end jd = commercial_to_jd(y, w, d) return unless gregorian?(jd, sg) return unless [y, w, d] == jd_to_commercial(jd) jd end
Is jd
a valid Julian Day Number?
If it is, returns it. In fact, any value is treated as a valid Julian Day Number.
# File date.rb, line 579 def self.valid_jd? (jd, sg=ITALY) jd end
Do the year y
and day-of-year d
make a valid
Ordinal Date? Returns the corresponding Julian Day
Number if they do, or nil if they don't.
d
can be a negative number, in which case it counts backwards
from the end of the year (-1 being the last day of the year). No year
wraparound is performed, however, so valid values of d
are
-365 .. -1, 1 .. 365 on a non-leap-year, -366 .. -1, 1 .. 366 on a leap
year. A date falling in the period skipped in the Day of Calendar Reform
adjustment is not valid.
sg
specifies the Day of Calendar Reform.
# File date.rb, line 594 def self.valid_ordinal? (y, d, sg=ITALY) if d < 0 ny, = (y + 1).divmod(1) jd = ordinal_to_jd(ny, d + 1, sg) ns = fix_style(jd, sg) return unless [y] == jd_to_ordinal(jd, sg)[0..0] return unless [ny, 1] == jd_to_ordinal(jd - d, ns) else jd = ordinal_to_jd(y, d, sg) return unless [y, d] == jd_to_ordinal(jd, sg) end jd end
Do hour h
, minute min
, and second s
constitute a valid time?
If they do, returns their value as a fraction of a day. If not, returns nil.
The 24-hour clock is used. Negative values of h
,
min
, and sec
are treating as counting backwards
from the end of the next larger unit (e.g. a min
of -2 is
treated as 58). No wraparound is performed.
# File date.rb, line 697 def self.valid_time? (h, min, s) h += 24 if h < 0 min += 60 if min < 0 s += 60 if s < 0 return unless ((0...24) === h && (0...60) === min && (0...60) === s) || (24 == h && 0 == min && 0 == s) time_to_day_fraction(h, min, s) end
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 1232 def + (n) case n when Numeric; return self.class.new!(@ajd + n, @of, @sg) end raise TypeError, 'expected numeric' end
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 1247 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
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 1321 def << (n) self >> -n end
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 1266 def <=> (other) case other when Numeric; return @ajd <=> other when Date; return @ajd <=> other.ajd end nil end
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 1280 def === (other) case other when Numeric; return jd == other when Date; return jd == other.jd end false end
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 1304 def >> (n) y, m = (year * 12 + (mon - 1) + n).divmod(12) m, = (m + 1) .divmod(1) d = mday until jd2 = self.class.valid_civil?(y, m, d, fix_style) d -= 1 raise ArgumentError, 'invalid date' unless d > 0 end self + (jd2 - jd) end
Dump to Marshal format.
# File date.rb, line 1386 def _dump(limit) Marshal.dump([@ajd, @of, @sg], -1) end
Get the date as an Astronomical Julian Day Number.
# File date.rb, line 1043 def ajd() @ajd end
Get the date as an Astronomical Modified Julian Day Number.
# File date.rb, line 1046 def amjd() self.class.ajd_to_amjd(@ajd) end
alias_method :format, :strftime
# File date/format.rb, line 352 def asctime() strftime('%c') end
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 1146 def cwday() commercial[2] end
Get the commercial week of the year of this date.
# File date.rb, line 1142 def cweek() commercial[1] end
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 1139 def cwyear() commercial[0] end
Get any fractional day part of the date.
# File date.rb, line 1054 def day_fraction() self.class.ajd_to_jd(@ajd, @of)[1] end
Step backward one day at a time until we reach min
(inclusive), yielding each date as we go.
# File date.rb, line 1365 def downto(min, &block) # :yield: date step(min, -1, &block) end
Create a copy of this Date object that uses the English/Colonial Day of Calendar Reform.
# File date.rb, line 1202 def england() new_start(self.class::ENGLAND) end
Create a copy of this Date object that always uses the Gregorian Calendar.
# File date.rb, line 1210 def gregorian() new_start(self.class::GREGORIAN) end
Is the current date new-style (Gregorian Calendar)?
# File date.rb, line 1170 def gregorian? () self.class.gregorian?(jd, @sg) end
Calculate a hash value for this date.
# File date.rb, line 1375 def hash() @ajd.hash end
Get the hour of this date.
# File date.rb, line 1112 def hour() time[0] end
Return internal object state as a programmer-readable string.
# File date.rb, line 1378 def inspect() format('#<%s: %s,%s,%s>', self.class, @ajd, @of, @sg) end
Create a copy of this Date object that uses the Italian/Catholic Day of Calendar Reform.
# File date.rb, line 1198 def italy() new_start(self.class::ITALY) end
Get the date as a Julian Day Number.
# File date.rb, line 1051 def jd() self.class.ajd_to_jd(@ajd, @of)[0] end
Create a copy of this Date object that always uses the Julian Calendar.
# File date.rb, line 1206 def julian() new_start(self.class::JULIAN) end
Is the current date old-style (Julian Calendar)?
# File date.rb, line 1167 def julian? () self.class.julian?(jd, @sg) end
Get the date as the number of days since the Day of Calendar Reform (in Italy and the Catholic countries).
# File date.rb, line 1061 def ld() self.class.jd_to_ld(jd) end
Is this a leap year?
# File date.rb, line 1183 def leap? self.class.jd_to_civil(self.class.civil_to_jd(year, 3, 1, fix_style) - 1, fix_style)[-1] == 29 end
Get the day-of-the-month of this date.
# File date.rb, line 1094 def mday() civil[2] end
Get the minute of this date.
# File date.rb, line 1115 def min() time[1] end
Get the date as a Modified Julian Day Number.
# File date.rb, line 1057 def mjd() self.class.jd_to_mjd(jd) end
Get the month of this date.
January is month 1.
# File date.rb, line 1091 def mon() civil[1] end
# File date.rb, line 1214 def new_offset(of=0) if String === of of = Rational(zone_to_diff(of) || 0, 86400) end self.class.new!(@ajd, of, @sg) end
Create a copy of this Date object using a new Day of Calendar Reform.
# File date.rb, line 1194 def new_start(sg=self.class::ITALY) self.class.new!(@ajd, @of, sg) end
Return a new Date one day after this one.
# File date.rb, line 1294 def next() next_day end
Get the second of this date.
# File date.rb, line 1118 def sec() time[2] end
Get the fraction-of-a-second of this date. The unit is in days. I do NOT recommend you to use this method.
# File date.rb, line 1122 def sec_fraction() time[3] end
When is the Day of Calendar Reform for this Date object?
# File date.rb, line 1191 def start() @sg end
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 1337 def step(limit, step=1) # :yield: date =begin if step.zero? raise ArgumentError, "step can't be 0" end =end =begin unless block_given? return to_enum(:step, limit, step) end =end da = self op = %w(- <= >=)[step <=> 0] while da.__send__(op, limit) yield da da += step end self end
# File date/format.rb, line 217 def strftime(fmt='%F') fmt.gsub(/%([-_0^#]+)?(\d+)?([EO]?(?::{1,3}z|.))/m) do |m| f = {} a = $& 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' emit_n((sec_fraction / MILLISECONDS_IN_DAY).floor, 3, 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' emit_n((sec_fraction / NANOSECONDS_IN_DAY).floor, 9, f) when 'n'; "\n" 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'; "\t" 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) when '1' if $VERBOSE warn("warning: strftime: %1 is deprecated; forget this") end emit_n(jd, 1, f) when '2' if $VERBOSE warn("warning: strftime: %2 is deprecated; use '%Y-%j'") end emit_a(strftime('%Y-%j'), 0, f) when '3' if $VERBOSE warn("warning: strftime: %3 is deprecated; use '%F'") end emit_a(strftime('%F'), 0, f) else a end end end
Return the date as a human-readable string.
The format used is YYYY-MM-DD.
# File date.rb, line 1383 def to_s() format('%.4d-%02d-%02d', year, mon, mday) end
Step forward one day at a time until we reach max
(inclusive),
yielding each date as we go.
# File date.rb, line 1359 def upto(max, &block) # :yield: date step(max, +1, &block) end
Get the week day of this date. Sunday is day-of-week 0; Saturday is day-of-week 6.
# File date.rb, line 1150 def wday() self.class.jd_to_wday(jd) end
Get the day-of-the-year of this date.
January 1 is day-of-the-year 1
# File date.rb, line 1086 def yday() ordinal[1] end