class Date
Class Date provides methods for storing and manipulating calendar dates.
Consider using class Time instead of class Date if:
-
You need both dates and times; Date handles only dates.
-
You need only Gregorian dates (and not Julian dates); see Julian and Gregorian Calendars.
A Date object, once created, is immutable, and cannot be modified.
Creating a Date¶ ↑
You can create a date for the current date, using Date.today
:
Date.today # => #<Date: 1999-12-31>
You can create a specific date from various combinations of arguments:
-
Date.new
takes integer year, month, and day-of-month:Date.new(1999, 12, 31) # => #<Date: 1999-12-31>
-
Date.ordinal
takes integer year and day-of-year:Date.ordinal(1999, 365) # => #<Date: 1999-12-31>
-
Date.jd
takes integer Julian day:Date.jd(2451544) # => #<Date: 1999-12-31>
-
Date.commercial
takes integer commercial data (year, week, day-of-week):Date.commercial(1999, 52, 5) # => #<Date: 1999-12-31>
-
Date.parse
takes a string, which it parses heuristically:Date.parse('1999-12-31') # => #<Date: 1999-12-31> Date.parse('31-12-1999') # => #<Date: 1999-12-31> Date.parse('1999-365') # => #<Date: 1999-12-31> Date.parse('1999-W52-5') # => #<Date: 1999-12-31>
-
Date.strptime
takes a date string and a format string, then parses the date string according to the format string:Date.strptime('1999-12-31', '%Y-%m-%d') # => #<Date: 1999-12-31> Date.strptime('31-12-1999', '%d-%m-%Y') # => #<Date: 1999-12-31> Date.strptime('1999-365', '%Y-%j') # => #<Date: 1999-12-31> Date.strptime('1999-W52-5', '%G-W%V-%u') # => #<Date: 1999-12-31> Date.strptime('1999 52 5', '%Y %U %w') # => #<Date: 1999-12-31> Date.strptime('1999 52 5', '%Y %W %u') # => #<Date: 1999-12-31> Date.strptime('fri31dec99', '%a%d%b%y') # => #<Date: 1999-12-31>
See also the specialized methods in “Specialized Format Strings” in Formats for Dates and Times
Argument limit
¶ ↑
Certain singleton methods in Date that parse string arguments also take optional keyword argument limit
, which can limit the length of the string argument.
When limit
is:
-
Non-negative: raises
ArgumentError
if the string length is greater than limit. -
Other numeric or
nil
: ignoreslimit
. -
Other non-numeric: raises
TypeError
.
Constants
- ABBR_DAYNAMES
An array of strings of abbreviated day names in
English
. The first is “Sun”.- ABBR_MONTHNAMES
An array of strings of abbreviated month names in
English
. The first element is nil.- DAYNAMES
An array of strings of the full names of days of the week in
English
. The first is “Sunday”.- ENGLAND
The Julian day number of the day of calendar reform for England and her colonies.
- GREGORIAN
The Julian day number of the day of calendar reform for the proleptic Gregorian calendar.
- ITALY
The Julian day number of the day of calendar reform for Italy and some catholic countries.
- JULIAN
The Julian day number of the day of calendar reform for the proleptic Julian calendar.
- MONTHNAMES
An array of strings of full month names in
English
. The first element is nil.
Public Class Methods
Returns a hash of values parsed from string
, which should be a valid HTTP date format:
d = Date.new(2001, 2, 3) s = d.httpdate # => "Sat, 03 Feb 2001 00:00:00 GMT" Date._httpdate(s) # => {:wday=>6, :mday=>3, :mon=>2, :year=>2001, :hour=>0, :min=>0, :sec=>0, :zone=>"GMT", :offset=>0}
Related: Date.httpdate
(returns a Date object).
static VALUE date_s__httpdate(int argc, VALUE *argv, VALUE klass) { VALUE str, opt; rb_scan_args(argc, argv, "1:", &str, &opt); check_limit(str, opt); return date__httpdate(str); }
Returns a hash of values parsed from string
, which should contain an ISO 8601 formatted date:
d = Date.new(2001, 2, 3) s = d.iso8601 # => "2001-02-03" Date._iso8601(s) # => {:mday=>3, :year=>2001, :mon=>2}
See argument limit.
Related: Date.iso8601
(returns a Date object).
static VALUE date_s__iso8601(int argc, VALUE *argv, VALUE klass) { VALUE str, opt; rb_scan_args(argc, argv, "1:", &str, &opt); check_limit(str, opt); return date__iso8601(str); }
Returns a hash of values parsed from string
, which should be a valid JIS X 0301 date format:
d = Date.new(2001, 2, 3) s = d.jisx0301 # => "H13.02.03" Date._jisx0301(s) # => {:year=>2001, :mon=>2, :mday=>3}
See argument limit.
Related: Date.jisx0301
(returns a Date object).
static VALUE date_s__jisx0301(int argc, VALUE *argv, VALUE klass) { VALUE str, opt; rb_scan_args(argc, argv, "1:", &str, &opt); check_limit(str, opt); return date__jisx0301(str); }
Note: This method recognizes many forms in string
, but it is not a validator. For formats, see “Specialized Format Strings” in Formats for Dates and Times
If string
does not specify a valid date, the result is unpredictable; consider using Date._strptime
instead.
Returns a hash of values parsed from string
:
Date._parse('2001-02-03') # => {:year=>2001, :mon=>2, :mday=>3}
If comp
is true
and the given year is in the range (0..99)
, the current century is supplied; otherwise, the year is taken as given:
Date._parse('01-02-03', true) # => {:year=>2001, :mon=>2, :mday=>3} Date._parse('01-02-03', false) # => {:year=>1, :mon=>2, :mday=>3}
See argument limit.
Related: Date.parse
(returns a Date object).
static VALUE date_s__parse(int argc, VALUE *argv, VALUE klass) { return date_s__parse_internal(argc, argv, klass); }
Returns a hash of values parsed from string
, which should be a valid RFC 2822 date format:
d = Date.new(2001, 2, 3) s = d.rfc2822 # => "Sat, 3 Feb 2001 00:00:00 +0000" Date._rfc2822(s) # => {:wday=>6, :mday=>3, :mon=>2, :year=>2001, :hour=>0, :min=>0, :sec=>0, :zone=>"+0000", :offset=>0}
See argument limit.
Date._rfc822
is an alias for Date._rfc2822
.
Related: Date.rfc2822
(returns a Date object).
static VALUE date_s__rfc2822(int argc, VALUE *argv, VALUE klass) { VALUE str, opt; rb_scan_args(argc, argv, "1:", &str, &opt); check_limit(str, opt); return date__rfc2822(str); }
Returns a hash of values parsed from string
, which should be a valid RFC 3339 format:
d = Date.new(2001, 2, 3) s = d.rfc3339 # => "2001-02-03T00:00:00+00:00" Date._rfc3339(s) # => {:year=>2001, :mon=>2, :mday=>3, :hour=>0, :min=>0, :sec=>0, :zone=>"+00:00", :offset=>0}
See argument limit.
Related: Date.rfc3339
(returns a Date object).
static VALUE date_s__rfc3339(int argc, VALUE *argv, VALUE klass) { VALUE str, opt; rb_scan_args(argc, argv, "1:", &str, &opt); check_limit(str, opt); return date__rfc3339(str); }
Returns a hash of values parsed from string
, which should be a valid RFC 2822 date format:
d = Date.new(2001, 2, 3) s = d.rfc2822 # => "Sat, 3 Feb 2001 00:00:00 +0000" Date._rfc2822(s) # => {:wday=>6, :mday=>3, :mon=>2, :year=>2001, :hour=>0, :min=>0, :sec=>0, :zone=>"+0000", :offset=>0}
See argument limit.
Date._rfc822
is an alias for Date._rfc2822
.
Related: Date.rfc2822
(returns a Date object).
static VALUE date_s__rfc2822(int argc, VALUE *argv, VALUE klass) { VALUE str, opt; rb_scan_args(argc, argv, "1:", &str, &opt); check_limit(str, opt); return date__rfc2822(str); }
Returns a hash of values parsed from string
according to the given format
:
Date._strptime('2001-02-03', '%Y-%m-%d') # => {:year=>2001, :mon=>2, :mday=>3}
For other formats, see Formats for Dates and Times. (Unlike Date.strftime
, does not support flags and width.)
See also strptime(3).
Related: Date.strptime
(returns a Date object).
static VALUE date_s__strptime(int argc, VALUE *argv, VALUE klass) { return date_s__strptime_internal(argc, argv, klass, "%F"); }
Returns a hash of values parsed from string
, which should be a valid XML date format:
d = Date.new(2001, 2, 3) s = d.xmlschema # => "2001-02-03" Date._xmlschema(s) # => {:year=>2001, :mon=>2, :mday=>3}
See argument limit.
Related: Date.xmlschema
(returns a Date object).
static VALUE date_s__xmlschema(int argc, VALUE *argv, VALUE klass) { VALUE str, opt; rb_scan_args(argc, argv, "1:", &str, &opt); check_limit(str, opt); return date__xmlschema(str); }
Same as Date.new
.
static VALUE date_s_civil(int argc, VALUE *argv, VALUE klass) { return date_initialize(argc, argv, d_lite_s_alloc_simple(klass)); }
Returns a new Date object constructed from the arguments.
Argument cwyear
gives the year, and should be an integer.
Argument cweek
gives the index of the week within the year, and should be in range (1..53) or (-53..-1); in some years, 53 or -53 will be out-of-range; if negative, counts backward from the end of the year:
Date.commercial(2022, 1, 1).to_s # => "2022-01-03" Date.commercial(2022, 52, 1).to_s # => "2022-12-26"
Argument cwday
gives the indes of the weekday within the week, and should be in range (1..7) or (-7..-1); 1 or -7 is Monday; if negative, counts backward from the end of the week:
Date.commercial(2022, 1, 1).to_s # => "2022-01-03" Date.commercial(2022, 1, -7).to_s # => "2022-01-03"
When cweek
is 1:
-
If January 1 is a Friday, Saturday, or Sunday, the first week begins in the week after:
Date::ABBR_DAYNAMES[Date.new(2023, 1, 1).wday] # => "Sun" Date.commercial(2023, 1, 1).to_s # => "2023-01-02" Date.commercial(2023, 1, 7).to_s # => "2023-01-08"
-
Otherwise, the first week is the week of January 1, which may mean some of the days fall on the year before:
Date::ABBR_DAYNAMES[Date.new(2020, 1, 1).wday] # => "Wed" Date.commercial(2020, 1, 1).to_s # => "2019-12-30" Date.commercial(2020, 1, 7).to_s # => "2020-01-05"
See argument start.
Related: Date.jd
, Date.new
, Date.ordinal
.
static VALUE date_s_commercial(int argc, VALUE *argv, VALUE klass) { VALUE vy, vw, vd, vsg, y, fr, fr2, ret; int w, d; double sg; rb_scan_args(argc, argv, "04", &vy, &vw, &vd, &vsg); y = INT2FIX(-4712); w = 1; d = 1; fr2 = INT2FIX(0); sg = DEFAULT_SG; switch (argc) { case 4: val2sg(vsg, sg); case 3: check_numeric(vd, "cwday"); num2int_with_frac(d, positive_inf); case 2: check_numeric(vw, "cweek"); w = NUM2INT(vw); case 1: check_numeric(vy, "year"); y = vy; } { VALUE nth; int ry, rw, rd, rjd, ns; if (!valid_commercial_p(y, w, d, sg, &nth, &ry, &rw, &rd, &rjd, &ns)) rb_raise(eDateError, "invalid date"); ret = d_simple_new_internal(klass, nth, rjd, sg, 0, 0, 0, HAVE_JD); } add_frac(); return ret; }
Returns true
if the given year is a leap year in the proleptic Gregorian calendar, false
otherwise:
Date.gregorian_leap?(2000) # => true Date.gregorian_leap?(2001) # => false
Date.leap?
is an alias for Date.gregorian_leap?
.
Related: Date.julian_leap?
.
static VALUE date_s_gregorian_leap_p(VALUE klass, VALUE y) { VALUE nth; int ry; check_numeric(y, "year"); decode_year(y, -1, &nth, &ry); return f_boolcast(c_gregorian_leap_p(ry)); }
Returns a new Date object with values parsed from string
, which should be a valid HTTP date format:
d = Date.new(2001, 2, 3) s = d.httpdate # => "Sat, 03 Feb 2001 00:00:00 GMT" Date.httpdate(s) # => #<Date: 2001-02-03>
See:
-
Argument start.
-
Argument limit.
Related: Date._httpdate
(returns a hash).
static VALUE date_s_httpdate(int argc, VALUE *argv, VALUE klass) { VALUE str, sg, opt; rb_scan_args(argc, argv, "02:", &str, &sg, &opt); switch (argc) { case 0: str = rb_str_new2("Mon, 01 Jan -4712 00:00:00 GMT"); case 1: sg = INT2FIX(DEFAULT_SG); } { int argc2 = 1; VALUE argv2[2], hash; argv2[0] = str; if (!NIL_P(opt)) argv2[argc2++] = opt; hash = date_s__httpdate(argc2, argv2, klass); return d_new_by_frags(klass, hash, sg); } }
Returns a new Date object with values parsed from string
, which should contain an ISO 8601 formatted date:
d = Date.new(2001, 2, 3) s = d.iso8601 # => "2001-02-03" Date.iso8601(s) # => #<Date: 2001-02-03>
See:
-
Argument start.
-
Argument limit.
Related: Date._iso8601
(returns a hash).
static VALUE date_s_iso8601(int argc, VALUE *argv, VALUE klass) { VALUE str, sg, opt; rb_scan_args(argc, argv, "02:", &str, &sg, &opt); if (!NIL_P(opt)) argc--; switch (argc) { case 0: str = rb_str_new2("-4712-01-01"); case 1: sg = INT2FIX(DEFAULT_SG); } { int argc2 = 1; VALUE argv2[2], hash; argv2[0] = str; if (!NIL_P(opt)) argv2[argc2++] = opt; hash = date_s__iso8601(argc2, argv2, klass); return d_new_by_frags(klass, hash, sg); } }
Returns a new Date object formed from the arguments:
Date.jd(2451944).to_s # => "2001-02-03" Date.jd(2451945).to_s # => "2001-02-04" Date.jd(0).to_s # => "-4712-01-01"
The returned date is:
-
Gregorian, if the argument is greater than or equal to
start
:Date::ITALY # => 2299161 Date.jd(Date::ITALY).gregorian? # => true Date.jd(Date::ITALY + 1).gregorian? # => true
-
Julian, otherwise
Date.jd(Date::ITALY - 1).julian? # => true
See argument start.
Related: Date.new
.
static VALUE date_s_jd(int argc, VALUE *argv, VALUE klass) { VALUE vjd, vsg, jd, fr, fr2, ret; double sg; rb_scan_args(argc, argv, "02", &vjd, &vsg); jd = INT2FIX(0); fr2 = INT2FIX(0); sg = DEFAULT_SG; switch (argc) { case 2: val2sg(vsg, sg); case 1: check_numeric(vjd, "jd"); num2num_with_frac(jd, positive_inf); } { VALUE nth; int rjd; decode_jd(jd, &nth, &rjd); ret = d_simple_new_internal(klass, nth, rjd, sg, 0, 0, 0, HAVE_JD); } add_frac(); return ret; }
Returns a new Date object with values parsed from string
, which should be a valid JIS X 0301 format:
d = Date.new(2001, 2, 3) s = d.jisx0301 # => "H13.02.03" Date.jisx0301(s) # => #<Date: 2001-02-03>
For no-era year, legacy format, Heisei is assumed.
Date.jisx0301('13.02.03') # => #<Date: 2001-02-03>
See:
-
Argument start.
-
Argument limit.
Related: Date._jisx0301
(returns a hash).
static VALUE date_s_jisx0301(int argc, VALUE *argv, VALUE klass) { VALUE str, sg, opt; rb_scan_args(argc, argv, "02:", &str, &sg, &opt); if (!NIL_P(opt)) argc--; switch (argc) { case 0: str = rb_str_new2("-4712-01-01"); case 1: sg = INT2FIX(DEFAULT_SG); } { int argc2 = 1; VALUE argv2[2], hash; argv2[0] = str; if (!NIL_P(opt)) argv2[argc2++] = opt; hash = date_s__jisx0301(argc2, argv2, klass); return d_new_by_frags(klass, hash, sg); } }
Returns true
if the given year is a leap year in the proleptic Julian calendar, false
otherwise:
Date.julian_leap?(1900) # => true Date.julian_leap?(1901) # => false
Related: Date.gregorian_leap?
.
static VALUE date_s_julian_leap_p(VALUE klass, VALUE y) { VALUE nth; int ry; check_numeric(y, "year"); decode_year(y, +1, &nth, &ry); return f_boolcast(c_julian_leap_p(ry)); }
Returns true
if the given year is a leap year in the proleptic Gregorian calendar, false
otherwise:
Date.gregorian_leap?(2000) # => true Date.gregorian_leap?(2001) # => false
Date.leap?
is an alias for Date.gregorian_leap?
.
Related: Date.julian_leap?
.
static VALUE date_s_gregorian_leap_p(VALUE klass, VALUE y) { VALUE nth; int ry; check_numeric(y, "year"); decode_year(y, -1, &nth, &ry); return f_boolcast(c_gregorian_leap_p(ry)); }
Returns a new Date object constructed from the given arguments:
Date.new(2022).to_s # => "2022-01-01" Date.new(2022, 2).to_s # => "2022-02-01" Date.new(2022, 2, 4).to_s # => "2022-02-04"
Argument month
should be in range (1..12) or range (-12..-1); when the argument is negative, counts backward from the end of the year:
Date.new(2022, -11, 4).to_s # => "2022-02-04"
Argument mday
should be in range (1..n) or range (-n..-1) where n
is the number of days in the month; when the argument is negative, counts backward from the end of the month.
See argument start.
Date.civil
is an alias for Date.new
.
Related: Date.jd
.
static VALUE date_initialize(int argc, VALUE *argv, VALUE self) { VALUE vy, vm, vd, vsg, y, fr, fr2, ret; int m, d; double sg; struct SimpleDateData *dat = rb_check_typeddata(self, &d_lite_type); if (!simple_dat_p(dat)) { rb_raise(rb_eTypeError, "Date expected"); } rb_scan_args(argc, argv, "04", &vy, &vm, &vd, &vsg); y = INT2FIX(-4712); m = 1; d = 1; fr2 = INT2FIX(0); sg = DEFAULT_SG; switch (argc) { case 4: val2sg(vsg, sg); case 3: check_numeric(vd, "day"); num2int_with_frac(d, positive_inf); case 2: check_numeric(vm, "month"); m = NUM2INT(vm); case 1: check_numeric(vy, "year"); y = vy; } if (guess_style(y, sg) < 0) { VALUE nth; int ry, rm, rd; if (!valid_gregorian_p(y, m, d, &nth, &ry, &rm, &rd)) rb_raise(eDateError, "invalid date"); set_to_simple(self, dat, nth, 0, sg, ry, rm, rd, HAVE_CIVIL); } else { VALUE nth; int ry, rm, rd, rjd, ns; if (!valid_civil_p(y, m, d, sg, &nth, &ry, &rm, &rd, &rjd, &ns)) rb_raise(eDateError, "invalid date"); set_to_simple(self, dat, nth, rjd, sg, ry, rm, rd, HAVE_JD | HAVE_CIVIL); } ret = self; add_frac(); return ret; }
Returns a new Date object formed fom the arguments.
With no arguments, returns the date for January 1, -4712:
Date.ordinal.to_s # => "-4712-01-01"
With argument year
, returns the date for January 1 of that year:
Date.ordinal(2001).to_s # => "2001-01-01" Date.ordinal(-2001).to_s # => "-2001-01-01"
With positive argument yday
== n
, returns the date for the nth
day of the given year:
Date.ordinal(2001, 14).to_s # => "2001-01-14"
With negative argument yday
, counts backward from the end of the year:
Date.ordinal(2001, -14).to_s # => "2001-12-18"
Raises an exception if yday
is zero or out of range.
See argument start.
static VALUE date_s_ordinal(int argc, VALUE *argv, VALUE klass) { VALUE vy, vd, vsg, y, fr, fr2, ret; int d; double sg; rb_scan_args(argc, argv, "03", &vy, &vd, &vsg); y = INT2FIX(-4712); d = 1; fr2 = INT2FIX(0); sg = DEFAULT_SG; switch (argc) { case 3: val2sg(vsg, sg); case 2: check_numeric(vd, "yday"); num2int_with_frac(d, positive_inf); case 1: check_numeric(vy, "year"); y = vy; } { VALUE nth; int ry, rd, rjd, ns; if (!valid_ordinal_p(y, d, sg, &nth, &ry, &rd, &rjd, &ns)) rb_raise(eDateError, "invalid date"); ret = d_simple_new_internal(klass, nth, rjd, sg, 0, 0, 0, HAVE_JD); } add_frac(); return ret; }
Note: This method recognizes many forms in string
, but it is not a validator. For formats, see “Specialized Format Strings” in Formats for Dates and Times If string
does not specify a valid date, the result is unpredictable; consider using Date._strptime
instead.
Returns a new Date object with values parsed from string
:
Date.parse('2001-02-03') # => #<Date: 2001-02-03> Date.parse('20010203') # => #<Date: 2001-02-03> Date.parse('3rd Feb 2001') # => #<Date: 2001-02-03>
If comp
is true
and the given year is in the range (0..99)
, the current century is supplied; otherwise, the year is taken as given:
Date.parse('01-02-03', true) # => #<Date: 2001-02-03> Date.parse('01-02-03', false) # => #<Date: 0001-02-03>
See:
-
Argument start.
-
Argument limit.
Related: Date._parse
(returns a hash).
static VALUE date_s_parse(int argc, VALUE *argv, VALUE klass) { VALUE str, comp, sg, opt; rb_scan_args(argc, argv, "03:", &str, &comp, &sg, &opt); if (!NIL_P(opt)) argc--; switch (argc) { case 0: str = rb_str_new2("-4712-01-01"); case 1: comp = Qtrue; case 2: sg = INT2FIX(DEFAULT_SG); } { int argc2 = 2; VALUE argv2[3], hash; argv2[0] = str; argv2[1] = comp; if (!NIL_P(opt)) argv2[argc2++] = opt; hash = date_s__parse(argc2, argv2, klass); return d_new_by_frags(klass, hash, sg); } }
Returns a new Date object with values parsed from string
, which should be a valid RFC 2822 date format:
d = Date.new(2001, 2, 3) s = d.rfc2822 # => "Sat, 3 Feb 2001 00:00:00 +0000" Date.rfc2822(s) # => #<Date: 2001-02-03>
See:
-
Argument start.
-
Argument limit.
Date.rfc822
is an alias for Date.rfc2822
.
Related: Date._rfc2822
(returns a hash).
static VALUE date_s_rfc2822(int argc, VALUE *argv, VALUE klass) { VALUE str, sg, opt; rb_scan_args(argc, argv, "02:", &str, &sg, &opt); switch (argc) { case 0: str = rb_str_new2("Mon, 1 Jan -4712 00:00:00 +0000"); case 1: sg = INT2FIX(DEFAULT_SG); } { int argc2 = 1; VALUE argv2[2], hash; argv2[0] = str; if (!NIL_P(opt)) argv2[argc2++] = opt; hash = date_s__rfc2822(argc2, argv2, klass); return d_new_by_frags(klass, hash, sg); } }
Returns a new Date object with values parsed from string
, which should be a valid RFC 3339 format:
d = Date.new(2001, 2, 3) s = d.rfc3339 # => "2001-02-03T00:00:00+00:00" Date.rfc3339(s) # => #<Date: 2001-02-03>
See:
-
Argument start.
-
Argument limit.
Related: Date._rfc3339
(returns a hash).
static VALUE date_s_rfc3339(int argc, VALUE *argv, VALUE klass) { VALUE str, sg, opt; rb_scan_args(argc, argv, "02:", &str, &sg, &opt); if (!NIL_P(opt)) argc--; switch (argc) { case 0: str = rb_str_new2("-4712-01-01T00:00:00+00:00"); case 1: sg = INT2FIX(DEFAULT_SG); } { int argc2 = 1; VALUE argv2[2], hash; argv2[0] = str; if (!NIL_P(opt)) argv2[argc2++] = opt; hash = date_s__rfc3339(argc2, argv2, klass); return d_new_by_frags(klass, hash, sg); } }
Returns a new Date object with values parsed from string
, which should be a valid RFC 2822 date format:
d = Date.new(2001, 2, 3) s = d.rfc2822 # => "Sat, 3 Feb 2001 00:00:00 +0000" Date.rfc2822(s) # => #<Date: 2001-02-03>
See:
-
Argument start.
-
Argument limit.
Date.rfc822
is an alias for Date.rfc2822
.
Related: Date._rfc2822
(returns a hash).
static VALUE date_s_rfc2822(int argc, VALUE *argv, VALUE klass) { VALUE str, sg, opt; rb_scan_args(argc, argv, "02:", &str, &sg, &opt); switch (argc) { case 0: str = rb_str_new2("Mon, 1 Jan -4712 00:00:00 +0000"); case 1: sg = INT2FIX(DEFAULT_SG); } { int argc2 = 1; VALUE argv2[2], hash; argv2[0] = str; if (!NIL_P(opt)) argv2[argc2++] = opt; hash = date_s__rfc2822(argc2, argv2, klass); return d_new_by_frags(klass, hash, sg); } }
Returns a new Date object with values parsed from string
, according to the given format
:
Date.strptime('2001-02-03', '%Y-%m-%d') # => #<Date: 2001-02-03> Date.strptime('03-02-2001', '%d-%m-%Y') # => #<Date: 2001-02-03> Date.strptime('2001-034', '%Y-%j') # => #<Date: 2001-02-03> Date.strptime('2001-W05-6', '%G-W%V-%u') # => #<Date: 2001-02-03> Date.strptime('2001 04 6', '%Y %U %w') # => #<Date: 2001-02-03> Date.strptime('2001 05 6', '%Y %W %u') # => #<Date: 2001-02-03> Date.strptime('sat3feb01', '%a%d%b%y') # => #<Date: 2001-02-03>
For other formats, see Formats for Dates and Times. (Unlike Date.strftime
, does not support flags and width.)
See argument start.
See also strptime(3).
Related: Date._strptime
(returns a hash).
static VALUE date_s_strptime(int argc, VALUE *argv, VALUE klass) { VALUE str, fmt, sg; rb_scan_args(argc, argv, "03", &str, &fmt, &sg); switch (argc) { case 0: str = rb_str_new2("-4712-01-01"); case 1: fmt = rb_str_new2("%F"); case 2: sg = INT2FIX(DEFAULT_SG); } { VALUE argv2[2], hash; argv2[0] = str; argv2[1] = fmt; hash = date_s__strptime(2, argv2, klass); return d_new_by_frags(klass, hash, sg); } }
Returns a new Date object constructed from the present date:
Date.today.to_s # => "2022-07-06"
See argument start.
static VALUE date_s_today(int argc, VALUE *argv, VALUE klass) { VALUE vsg, nth, ret; double sg; time_t t; struct tm tm; int y, ry, m, d; rb_scan_args(argc, argv, "01", &vsg); if (argc < 1) sg = DEFAULT_SG; else val2sg(vsg, sg); if (time(&t) == -1) rb_sys_fail("time"); tzset(); if (!localtime_r(&t, &tm)) rb_sys_fail("localtime"); y = tm.tm_year + 1900; m = tm.tm_mon + 1; d = tm.tm_mday; decode_year(INT2FIX(y), -1, &nth, &ry); ret = d_simple_new_internal(klass, nth, 0, GREGORIAN, ry, m, d, HAVE_CIVIL); { get_d1(ret); set_sg(dat, sg); } return ret; }
Returns true
if the arguments define a valid ordinal date, false
otherwise:
Date.valid_date?(2001, 2, 3) # => true Date.valid_date?(2001, 2, 29) # => false Date.valid_date?(2001, 2, -1) # => true
See argument start.
Date.valid_date?
is an alias for Date.valid_civil?
.
static VALUE date_s_valid_civil_p(int argc, VALUE *argv, VALUE klass) { VALUE vy, vm, vd, vsg; VALUE argv2[4]; rb_scan_args(argc, argv, "31", &vy, &vm, &vd, &vsg); RETURN_FALSE_UNLESS_NUMERIC(vy); RETURN_FALSE_UNLESS_NUMERIC(vm); RETURN_FALSE_UNLESS_NUMERIC(vd); argv2[0] = vy; argv2[1] = vm; argv2[2] = vd; if (argc < 4) argv2[3] = INT2FIX(DEFAULT_SG); else argv2[3] = vsg; if (NIL_P(valid_civil_sub(4, argv2, klass, 0))) return Qfalse; return Qtrue; }
Returns true
if the arguments define a valid commercial date, false
otherwise:
Date.valid_commercial?(2001, 5, 6) # => true Date.valid_commercial?(2001, 5, 8) # => false
See Date.commercial
.
See argument start.
Related: Date.jd
, Date.commercial
.
static VALUE date_s_valid_commercial_p(int argc, VALUE *argv, VALUE klass) { VALUE vy, vw, vd, vsg; VALUE argv2[4]; rb_scan_args(argc, argv, "31", &vy, &vw, &vd, &vsg); RETURN_FALSE_UNLESS_NUMERIC(vy); RETURN_FALSE_UNLESS_NUMERIC(vw); RETURN_FALSE_UNLESS_NUMERIC(vd); argv2[0] = vy; argv2[1] = vw; argv2[2] = vd; if (argc < 4) argv2[3] = INT2FIX(DEFAULT_SG); else argv2[3] = vsg; if (NIL_P(valid_commercial_sub(4, argv2, klass, 0))) return Qfalse; return Qtrue; }
Returns true
if the arguments define a valid ordinal date, false
otherwise:
Date.valid_date?(2001, 2, 3) # => true Date.valid_date?(2001, 2, 29) # => false Date.valid_date?(2001, 2, -1) # => true
See argument start.
Date.valid_date?
is an alias for Date.valid_civil?
.
static VALUE date_s_valid_civil_p(int argc, VALUE *argv, VALUE klass) { VALUE vy, vm, vd, vsg; VALUE argv2[4]; rb_scan_args(argc, argv, "31", &vy, &vm, &vd, &vsg); RETURN_FALSE_UNLESS_NUMERIC(vy); RETURN_FALSE_UNLESS_NUMERIC(vm); RETURN_FALSE_UNLESS_NUMERIC(vd); argv2[0] = vy; argv2[1] = vm; argv2[2] = vd; if (argc < 4) argv2[3] = INT2FIX(DEFAULT_SG); else argv2[3] = vsg; if (NIL_P(valid_civil_sub(4, argv2, klass, 0))) return Qfalse; return Qtrue; }
Implemented for compatibility; returns true
unless jd
is invalid (i.e., not a Numeric
).
Date.valid_jd?(2451944) # => true
See argument start.
Related: Date.jd
.
static VALUE date_s_valid_jd_p(int argc, VALUE *argv, VALUE klass) { VALUE vjd, vsg; VALUE argv2[2]; rb_scan_args(argc, argv, "11", &vjd, &vsg); RETURN_FALSE_UNLESS_NUMERIC(vjd); argv2[0] = vjd; if (argc < 2) argv2[1] = INT2FIX(DEFAULT_SG); else argv2[1] = vsg; if (NIL_P(valid_jd_sub(2, argv2, klass, 0))) return Qfalse; return Qtrue; }
Returns true
if the arguments define a valid ordinal date, false
otherwise:
Date.valid_ordinal?(2001, 34) # => true Date.valid_ordinal?(2001, 366) # => false
See argument start.
Related: Date.jd
, Date.ordinal
.
static VALUE date_s_valid_ordinal_p(int argc, VALUE *argv, VALUE klass) { VALUE vy, vd, vsg; VALUE argv2[3]; rb_scan_args(argc, argv, "21", &vy, &vd, &vsg); RETURN_FALSE_UNLESS_NUMERIC(vy); RETURN_FALSE_UNLESS_NUMERIC(vd); argv2[0] = vy; argv2[1] = vd; if (argc < 3) argv2[2] = INT2FIX(DEFAULT_SG); else argv2[2] = vsg; if (NIL_P(valid_ordinal_sub(3, argv2, klass, 0))) return Qfalse; return Qtrue; }
Returns a new Date object with values parsed from string
, which should be a valid XML date format:
d = Date.new(2001, 2, 3) s = d.xmlschema # => "2001-02-03" Date.xmlschema(s) # => #<Date: 2001-02-03>
See:
-
Argument start.
-
Argument limit.
Related: Date._xmlschema
(returns a hash).
static VALUE date_s_xmlschema(int argc, VALUE *argv, VALUE klass) { VALUE str, sg, opt; rb_scan_args(argc, argv, "02:", &str, &sg, &opt); if (!NIL_P(opt)) argc--; switch (argc) { case 0: str = rb_str_new2("-4712-01-01"); case 1: sg = INT2FIX(DEFAULT_SG); } { int argc2 = 1; VALUE argv2[2], hash; argv2[0] = str; if (!NIL_P(opt)) argv2[argc2++] = opt; hash = date_s__xmlschema(argc2, argv2, klass); return d_new_by_frags(klass, hash, sg); } }
Public Instance Methods
Returns a date object pointing other
days after self. The other should be a numeric value. If the other is a fractional number, assumes its precision is at most nanosecond.
Date.new(2001,2,3) + 1 #=> #<Date: 2001-02-04 ...> DateTime.new(2001,2,3) + Rational(1,2) #=> #<DateTime: 2001-02-03T12:00:00+00:00 ...> DateTime.new(2001,2,3) + Rational(-1,2) #=> #<DateTime: 2001-02-02T12:00:00+00:00 ...> DateTime.jd(0,12) + DateTime.new(2001,2,3).ajd #=> #<DateTime: 2001-02-03T00:00:00+00:00 ...>
static VALUE d_lite_plus(VALUE self, VALUE other) { int try_rational = 1; get_d1(self); again: switch (TYPE(other)) { case T_FIXNUM: { VALUE nth; long t; int jd; nth = m_nth(dat); t = FIX2LONG(other); if (DIV(t, CM_PERIOD)) { nth = f_add(nth, INT2FIX(DIV(t, CM_PERIOD))); t = MOD(t, CM_PERIOD); } if (!t) jd = m_jd(dat); else { jd = m_jd(dat) + (int)t; canonicalize_jd(nth, jd); } if (simple_dat_p(dat)) return d_simple_new_internal(rb_obj_class(self), nth, jd, dat->s.sg, 0, 0, 0, (dat->s.flags | HAVE_JD) & ~HAVE_CIVIL); else return d_complex_new_internal(rb_obj_class(self), nth, jd, dat->c.df, dat->c.sf, dat->c.of, dat->c.sg, 0, 0, 0, #ifndef USE_PACK dat->c.hour, dat->c.min, dat->c.sec, #else EX_HOUR(dat->c.pc), EX_MIN(dat->c.pc), EX_SEC(dat->c.pc), #endif (dat->c.flags | HAVE_JD) & ~HAVE_CIVIL); } break; case T_BIGNUM: { VALUE nth; int jd, s; if (f_positive_p(other)) s = +1; else { s = -1; other = f_negate(other); } nth = f_idiv(other, INT2FIX(CM_PERIOD)); jd = FIX2INT(f_mod(other, INT2FIX(CM_PERIOD))); if (s < 0) { nth = f_negate(nth); jd = -jd; } if (!jd) jd = m_jd(dat); else { jd = m_jd(dat) + jd; canonicalize_jd(nth, jd); } if (f_zero_p(nth)) nth = m_nth(dat); else nth = f_add(m_nth(dat), nth); if (simple_dat_p(dat)) return d_simple_new_internal(rb_obj_class(self), nth, jd, dat->s.sg, 0, 0, 0, (dat->s.flags | HAVE_JD) & ~HAVE_CIVIL); else return d_complex_new_internal(rb_obj_class(self), nth, jd, dat->c.df, dat->c.sf, dat->c.of, dat->c.sg, 0, 0, 0, #ifndef USE_PACK dat->c.hour, dat->c.min, dat->c.sec, #else EX_HOUR(dat->c.pc), EX_MIN(dat->c.pc), EX_SEC(dat->c.pc), #endif (dat->c.flags | HAVE_JD) & ~HAVE_CIVIL); } break; case T_FLOAT: { double jd, o, tmp; int s, df; VALUE nth, sf; o = RFLOAT_VALUE(other); if (o > 0) s = +1; else { s = -1; o = -o; } o = modf(o, &tmp); if (!floor(tmp / CM_PERIOD)) { nth = INT2FIX(0); jd = (int)tmp; } else { double i, f; f = modf(tmp / CM_PERIOD, &i); nth = f_floor(DBL2NUM(i)); jd = (int)(f * CM_PERIOD); } o *= DAY_IN_SECONDS; o = modf(o, &tmp); df = (int)tmp; o *= SECOND_IN_NANOSECONDS; sf = INT2FIX((int)round(o)); if (s < 0) { jd = -jd; df = -df; sf = f_negate(sf); } if (f_zero_p(sf)) sf = m_sf(dat); else { sf = f_add(m_sf(dat), sf); if (f_lt_p(sf, INT2FIX(0))) { df -= 1; sf = f_add(sf, INT2FIX(SECOND_IN_NANOSECONDS)); } else if (f_ge_p(sf, INT2FIX(SECOND_IN_NANOSECONDS))) { df += 1; sf = f_sub(sf, INT2FIX(SECOND_IN_NANOSECONDS)); } } if (!df) df = m_df(dat); else { df = m_df(dat) + df; if (df < 0) { jd -= 1; df += DAY_IN_SECONDS; } else if (df >= DAY_IN_SECONDS) { jd += 1; df -= DAY_IN_SECONDS; } } if (!jd) jd = m_jd(dat); else { jd = m_jd(dat) + jd; canonicalize_jd(nth, jd); } if (f_zero_p(nth)) nth = m_nth(dat); else nth = f_add(m_nth(dat), nth); if (!df && f_zero_p(sf) && !m_of(dat)) return d_simple_new_internal(rb_obj_class(self), nth, (int)jd, m_sg(dat), 0, 0, 0, (dat->s.flags | HAVE_JD) & ~(HAVE_CIVIL | HAVE_TIME | COMPLEX_DAT)); else return d_complex_new_internal(rb_obj_class(self), nth, (int)jd, df, sf, m_of(dat), m_sg(dat), 0, 0, 0, 0, 0, 0, (dat->c.flags | HAVE_JD | HAVE_DF) & ~(HAVE_CIVIL | HAVE_TIME)); } break; default: expect_numeric(other); other = f_to_r(other); if (!k_rational_p(other)) { if (!try_rational) Check_Type(other, T_RATIONAL); try_rational = 0; goto again; } /* fall through */ case T_RATIONAL: { VALUE nth, sf, t; int jd, df, s; if (wholenum_p(other)) { other = rb_rational_num(other); goto again; } if (f_positive_p(other)) s = +1; else { s = -1; other = f_negate(other); } nth = f_idiv(other, INT2FIX(CM_PERIOD)); t = f_mod(other, INT2FIX(CM_PERIOD)); jd = FIX2INT(f_idiv(t, INT2FIX(1))); t = f_mod(t, INT2FIX(1)); t = f_mul(t, INT2FIX(DAY_IN_SECONDS)); df = FIX2INT(f_idiv(t, INT2FIX(1))); t = f_mod(t, INT2FIX(1)); sf = f_mul(t, INT2FIX(SECOND_IN_NANOSECONDS)); if (s < 0) { nth = f_negate(nth); jd = -jd; df = -df; sf = f_negate(sf); } if (f_zero_p(sf)) sf = m_sf(dat); else { sf = f_add(m_sf(dat), sf); if (f_lt_p(sf, INT2FIX(0))) { df -= 1; sf = f_add(sf, INT2FIX(SECOND_IN_NANOSECONDS)); } else if (f_ge_p(sf, INT2FIX(SECOND_IN_NANOSECONDS))) { df += 1; sf = f_sub(sf, INT2FIX(SECOND_IN_NANOSECONDS)); } } if (!df) df = m_df(dat); else { df = m_df(dat) + df; if (df < 0) { jd -= 1; df += DAY_IN_SECONDS; } else if (df >= DAY_IN_SECONDS) { jd += 1; df -= DAY_IN_SECONDS; } } if (!jd) jd = m_jd(dat); else { jd = m_jd(dat) + jd; canonicalize_jd(nth, jd); } if (f_zero_p(nth)) nth = m_nth(dat); else nth = f_add(m_nth(dat), nth); if (!df && f_zero_p(sf) && !m_of(dat)) return d_simple_new_internal(rb_obj_class(self), nth, jd, m_sg(dat), 0, 0, 0, (dat->s.flags | HAVE_JD) & ~(HAVE_CIVIL | HAVE_TIME | COMPLEX_DAT)); else return d_complex_new_internal(rb_obj_class(self), nth, jd, df, sf, m_of(dat), m_sg(dat), 0, 0, 0, 0, 0, 0, (dat->c.flags | HAVE_JD | HAVE_DF) & ~(HAVE_CIVIL | HAVE_TIME)); } break; } }
Returns the difference between the two dates if the other is a date object. If the other is a numeric value, returns a date object pointing other
days before self. If the other is a fractional number, assumes its precision is at most nanosecond.
Date.new(2001,2,3) - 1 #=> #<Date: 2001-02-02 ...> DateTime.new(2001,2,3) - Rational(1,2) #=> #<DateTime: 2001-02-02T12:00:00+00:00 ...> Date.new(2001,2,3) - Date.new(2001) #=> (33/1) DateTime.new(2001,2,3) - DateTime.new(2001,2,2,12) #=> (1/2)
static VALUE d_lite_minus(VALUE self, VALUE other) { if (k_date_p(other)) return minus_dd(self, other); switch (TYPE(other)) { case T_FIXNUM: return d_lite_plus(self, LONG2NUM(-FIX2LONG(other))); case T_FLOAT: return d_lite_plus(self, DBL2NUM(-RFLOAT_VALUE(other))); default: expect_numeric(other); /* fall through */ case T_BIGNUM: case T_RATIONAL: return d_lite_plus(self, f_negate(other)); } }
Returns a new Date object representing the date n
months earlier; n
should be a numeric:
(Date.new(2001, 2, 3) << 1).to_s # => "2001-01-03" (Date.new(2001, 2, 3) << -2).to_s # => "2001-04-03"
When the same day does not exist for the new month, the last day of that month is used instead:
(Date.new(2001, 3, 31) << 1).to_s # => "2001-02-28" (Date.new(2001, 3, 31) << -6).to_s # => "2001-09-30"
This results in the following, possibly unexpected, behaviors:
d0 = Date.new(2001, 3, 31) d0 << 2 # => #<Date: 2001-01-31> d0 << 1 << 1 # => #<Date: 2001-01-28> d0 = Date.new(2001, 3, 31) d1 = d0 << 1 # => #<Date: 2001-02-28> d2 = d1 << -1 # => #<Date: 2001-03-28>
static VALUE d_lite_lshift(VALUE self, VALUE other) { expect_numeric(other); return d_lite_rshift(self, f_negate(other)); }
Compares self
and other
, returning:
-
-1
ifother
is larger. -
0
if the two are equal. -
1
ifother
is smaller. -
nil
if the two are incomparable.
Argument other
may be:
-
Another Date object:
d = Date.new(2022, 7, 27) # => #<Date: 2022-07-27 ((2459788j,0s,0n),+0s,2299161j)> prev_date = d.prev_day # => #<Date: 2022-07-26 ((2459787j,0s,0n),+0s,2299161j)> next_date = d.next_day # => #<Date: 2022-07-28 ((2459789j,0s,0n),+0s,2299161j)> d <=> next_date # => -1 d <=> d # => 0 d <=> prev_date # => 1
-
A
DateTime
object:d <=> DateTime.new(2022, 7, 26) # => 1 d <=> DateTime.new(2022, 7, 27) # => 0 d <=> DateTime.new(2022, 7, 28) # => -1
-
A numeric (compares
self.ajd
toother
):d <=> 2459788 # => -1 d <=> 2459787 # => 1 d <=> 2459786 # => 1 d <=> d.ajd # => 0
-
Any other object:
d <=> Object.new # => nil
static VALUE d_lite_cmp(VALUE self, VALUE other) { if (!k_date_p(other)) return cmp_gen(self, other); { get_d2(self, other); if (!(simple_dat_p(adat) && simple_dat_p(bdat) && m_gregorian_p(adat) == m_gregorian_p(bdat))) return cmp_dd(self, other); { VALUE a_nth, b_nth; int a_jd, b_jd; m_canonicalize_jd(self, adat); m_canonicalize_jd(other, bdat); a_nth = m_nth(adat); b_nth = m_nth(bdat); if (f_eqeq_p(a_nth, b_nth)) { a_jd = m_jd(adat); b_jd = m_jd(bdat); if (a_jd == b_jd) { return INT2FIX(0); } else if (a_jd < b_jd) { return INT2FIX(-1); } else { return INT2FIX(1); } } else if (f_lt_p(a_nth, b_nth)) { return INT2FIX(-1); } else { return INT2FIX(1); } } } }
Returns true
if self
and other
represent the same date, false
if not, nil
if the two are not comparable.
Argument other
may be:
-
Another Date object:
d = Date.new(2022, 7, 27) # => #<Date: 2022-07-27 ((2459788j,0s,0n),+0s,2299161j)> prev_date = d.prev_day # => #<Date: 2022-07-26 ((2459787j,0s,0n),+0s,2299161j)> next_date = d.next_day # => #<Date: 2022-07-28 ((2459789j,0s,0n),+0s,2299161j)> d === prev_date # => false d === d # => true d === next_date # => false
-
A
DateTime
object:d === DateTime.new(2022, 7, 26) # => false d === DateTime.new(2022, 7, 27) # => true d === DateTime.new(2022, 7, 28) # => false
-
A numeric (compares
self.jd
toother
):d === 2459788 # => true d === 2459787 # => false d === 2459786 # => false d === d.jd # => true
-
An object not comparable:
d === Object.new # => nil
static VALUE d_lite_equal(VALUE self, VALUE other) { if (!k_date_p(other)) return equal_gen(self, other); { get_d2(self, other); if (!(m_gregorian_p(adat) == m_gregorian_p(bdat))) return equal_gen(self, other); { VALUE a_nth, b_nth; int a_jd, b_jd; m_canonicalize_jd(self, adat); m_canonicalize_jd(other, bdat); a_nth = m_nth(adat); b_nth = m_nth(bdat); a_jd = m_local_jd(adat); b_jd = m_local_jd(bdat); if (f_eqeq_p(a_nth, b_nth) && a_jd == b_jd) return Qtrue; return Qfalse; } } }
Returns a new Date object representing the date n
months later; n
should be a numeric:
(Date.new(2001, 2, 3) >> 1).to_s # => "2001-03-03" (Date.new(2001, 2, 3) >> -2).to_s # => "2000-12-03"
When the same day does not exist for the new month, the last day of that month is used instead:
(Date.new(2001, 1, 31) >> 1).to_s # => "2001-02-28" (Date.new(2001, 1, 31) >> -4).to_s # => "2000-09-30"
This results in the following, possibly unexpected, behaviors:
d0 = Date.new(2001, 1, 31) d1 = d0 >> 1 # => #<Date: 2001-02-28> d2 = d1 >> 1 # => #<Date: 2001-03-28> d0 = Date.new(2001, 1, 31) d1 = d0 >> 1 # => #<Date: 2001-02-28> d2 = d1 >> -1 # => #<Date: 2001-01-28>
static VALUE d_lite_rshift(VALUE self, VALUE other) { VALUE t, y, nth, rjd2; int m, d, rjd; double sg; get_d1(self); t = f_add3(f_mul(m_real_year(dat), INT2FIX(12)), INT2FIX(m_mon(dat) - 1), other); if (FIXNUM_P(t)) { long it = FIX2LONG(t); y = LONG2NUM(DIV(it, 12)); it = MOD(it, 12); m = (int)it + 1; } else { y = f_idiv(t, INT2FIX(12)); t = f_mod(t, INT2FIX(12)); m = FIX2INT(t) + 1; } d = m_mday(dat); sg = m_sg(dat); while (1) { int ry, rm, rd, ns; if (valid_civil_p(y, m, d, sg, &nth, &ry, &rm, &rd, &rjd, &ns)) break; if (--d < 1) rb_raise(eDateError, "invalid date"); } encode_jd(nth, rjd, &rjd2); return d_lite_plus(self, f_sub(rjd2, m_real_local_jd(dat))); }
Returns the astronomical Julian day number. This is a fractional number, which is not adjusted by the offset.
DateTime.new(2001,2,3,4,5,6,'+7').ajd #=> (11769328217/4800) DateTime.new(2001,2,2,14,5,6,'-7').ajd #=> (11769328217/4800)
static VALUE d_lite_ajd(VALUE self) { get_d1(self); return m_ajd(dat); }
Returns the astronomical modified Julian day number. This is a fractional number, which is not adjusted by the offset.
DateTime.new(2001,2,3,4,5,6,'+7').amjd #=> (249325817/4800) DateTime.new(2001,2,2,14,5,6,'-7').amjd #=> (249325817/4800)
static VALUE d_lite_amjd(VALUE self) { get_d1(self); return m_amjd(dat); }
Returns a hash, that will be turned into a JSON
object and represent this object.
# File ext/json/lib/json/add/date.rb, line 19 def as_json(*) { JSON.create_id => self.class.name, 'y' => year, 'm' => month, 'd' => day, 'sg' => start, } end
Equivalent to strftime
with argument '%a %b %e %T %Y'
(or its shorthand form '%c'
):
Date.new(2001, 2, 3).asctime # => "Sat Feb 3 00:00:00 2001"
See asctime.
Date#ctime
is an alias for Date#asctime
.
static VALUE d_lite_asctime(VALUE self) { return strftimev("%a %b %e %H:%M:%S %Y", self, set_tmx); }
Equivalent to strftime
with argument '%a %b %e %T %Y'
(or its shorthand form '%c'
):
Date.new(2001, 2, 3).asctime # => "Sat Feb 3 00:00:00 2001"
See asctime.
Date#ctime
is an alias for Date#asctime
.
Returns the commercial-date weekday index for self
(see Date.commercial
); 1 is Monday:
Date.new(2001, 2, 3).cwday # => 6
static VALUE d_lite_cwday(VALUE self) { get_d1(self); return INT2FIX(m_cwday(dat)); }
Returns commercial-date week index for self
(see Date.commercial
):
Date.new(2001, 2, 3).cweek # => 5
static VALUE d_lite_cweek(VALUE self) { get_d1(self); return INT2FIX(m_cweek(dat)); }
Returns commercial-date year for self
(see Date.commercial
):
Date.new(2001, 2, 3).cwyear # => 2001 Date.new(2000, 1, 1).cwyear # => 1999
static VALUE d_lite_cwyear(VALUE self) { get_d1(self); return m_real_cwyear(dat); }
Returns the day of the month in range (1..31):
Date.new(2001, 2, 3).mday # => 3
Returns the fractional part of the day in range (Rational(0, 1)…Rational(1, 1)):
DateTime.new(2001,2,3,12).day_fraction # => (1/2)
static VALUE d_lite_day_fraction(VALUE self) { get_d1(self); if (simple_dat_p(dat)) return INT2FIX(0); return m_fr(dat); }
Returns a hash of the name/value pairs, to use in pattern matching. Possible keys are: :year
, :month
, :day
, :wday
, :yday
.
Possible usages:
d = Date.new(2022, 10, 5) if d in wday: 3, day: ..7 # uses deconstruct_keys underneath puts "first Wednesday of the month" end #=> prints "first Wednesday of the month" case d in year: ...2022 puts "too old" in month: ..9 puts "quarter 1-3" in wday: 1..5, month: puts "working day in month #{month}" end #=> prints "working day in month 10"
Note that deconstruction by pattern can also be combined with class check:
if d in Date(wday: 3, day: ..7) puts "first Wednesday of the month" end
static VALUE d_lite_deconstruct_keys(VALUE self, VALUE keys) { return deconstruct_keys(self, keys, /* is_datetime=false */ 0); }
Equivalent to step
with arguments min
and -1
.
static VALUE d_lite_downto(VALUE self, VALUE min) { VALUE date; RETURN_ENUMERATOR(self, 1, &min); date = self; while (FIX2INT(d_lite_cmp(date, min)) >= 0) { rb_yield(date); date = d_lite_plus(date, INT2FIX(-1)); } return self; }
Equivalent to Date#new_start
with argument Date::ENGLAND
.
static VALUE d_lite_england(VALUE self) { return dup_obj_with_new_start(self, ENGLAND); }
Returns true
if self
is a Friday, false
otherwise.
static VALUE d_lite_friday_p(VALUE self) { get_d1(self); return f_boolcast(m_wday(dat) == 5); }
Equivalent to Date#new_start
with argument Date::GREGORIAN
.
static VALUE d_lite_gregorian(VALUE self) { return dup_obj_with_new_start(self, GREGORIAN); }
Returns true
if the date is on or after the date of calendar reform, false
otherwise:
Date.new(1582, 10, 15).gregorian? # => true (Date.new(1582, 10, 15) - 1).gregorian? # => false
static VALUE d_lite_gregorian_p(VALUE self) { get_d1(self); return f_boolcast(m_gregorian_p(dat)); }
Equivalent to strftime
with argument '%a, %d %b %Y %T GMT'
; see Formats for Dates and Times:
Date.new(2001, 2, 3).httpdate # => "Sat, 03 Feb 2001 00:00:00 GMT"
static VALUE d_lite_httpdate(VALUE self) { volatile VALUE dup = dup_obj_with_new_offset(self, 0); return strftimev("%a, %d %b %Y %T GMT", dup, set_tmx); }
Returns false
# File ext/date/lib/date.rb, line 13 def infinite? false end
Returns a string representation of self
:
Date.new(2001, 2, 3).inspect # => "#<Date: 2001-02-03 ((2451944j,0s,0n),+0s,2299161j)>"
static VALUE d_lite_inspect(VALUE self) { get_d1(self); return mk_inspect(dat, rb_obj_class(self), self); }
Equivalent to strftime
with argument '%Y-%m-%d'
(or its shorthand form '%F'
);
Date.new(2001, 2, 3).iso8601 # => "2001-02-03"
Date#xmlschema
is an alias for Date#iso8601
.
static VALUE d_lite_iso8601(VALUE self) { return strftimev("%Y-%m-%d", self, set_tmx); }
Equivalent to Date#new_start
with argument Date::ITALY
.
static VALUE d_lite_italy(VALUE self) { return dup_obj_with_new_start(self, ITALY); }
Returns the Julian day number. This is a whole number, which is adjusted by the offset as the local time.
DateTime.new(2001,2,3,4,5,6,'+7').jd #=> 2451944 DateTime.new(2001,2,3,4,5,6,'-7').jd #=> 2451944
static VALUE d_lite_jd(VALUE self) { get_d1(self); return m_real_local_jd(dat); }
Returns a string representation of the date in self
in JIS X 0301 format.
Date.new(2001, 2, 3).jisx0301 # => "H13.02.03"
static VALUE d_lite_jisx0301(VALUE self) { char fmtbuf[JISX0301_DATE_SIZE]; const char *fmt; get_d1(self); fmt = jisx0301_date_format(fmtbuf, sizeof(fmtbuf), m_real_local_jd(dat), m_real_year(dat)); return strftimev(fmt, self, set_tmx); }
Equivalent to Date#new_start
with argument Date::JULIAN
.
static VALUE d_lite_julian(VALUE self) { return dup_obj_with_new_start(self, JULIAN); }
Returns true
if the date is before the date of calendar reform, false
otherwise:
(Date.new(1582, 10, 15) - 1).julian? # => true Date.new(1582, 10, 15).julian? # => false
static VALUE d_lite_julian_p(VALUE self) { get_d1(self); return f_boolcast(m_julian_p(dat)); }
Returns the Lilian day number, which is the number of days since the beginning of the Gregorian calendar, October 15, 1582.
Date.new(2001, 2, 3).ld # => 152784
static VALUE d_lite_ld(VALUE self) { get_d1(self); return f_sub(m_real_local_jd(dat), INT2FIX(2299160)); }
Returns true
if the year is a leap year, false
otherwise:
Date.new(2000).leap? # => true Date.new(2001).leap? # => false
static VALUE d_lite_leap_p(VALUE self) { int rjd, ns, ry, rm, rd; get_d1(self); if (m_gregorian_p(dat)) return f_boolcast(c_gregorian_leap_p(m_year(dat))); c_civil_to_jd(m_year(dat), 3, 1, m_virtual_sg(dat), &rjd, &ns); c_jd_to_civil(rjd - 1, m_virtual_sg(dat), &ry, &rm, &rd); return f_boolcast(rd == 29); }
Returns the day of the month in range (1..31):
Date.new(2001, 2, 3).mday # => 3
Date#day
is an alias for Date#mday
.
static VALUE d_lite_mday(VALUE self) { get_d1(self); return INT2FIX(m_mday(dat)); }
Returns the modified Julian day number. This is a whole number, which is adjusted by the offset as the local time.
DateTime.new(2001,2,3,4,5,6,'+7').mjd #=> 51943 DateTime.new(2001,2,3,4,5,6,'-7').mjd #=> 51943
static VALUE d_lite_mjd(VALUE self) { get_d1(self); return f_sub(m_real_local_jd(dat), INT2FIX(2400001)); }
Returns the month in range (1..12):
Date.new(2001, 2, 3).mon # => 2
Date#month
is an alias for Date#mon
.
static VALUE d_lite_mon(VALUE self) { get_d1(self); return INT2FIX(m_mon(dat)); }
Returns true
if self
is a Monday, false
otherwise.
static VALUE d_lite_monday_p(VALUE self) { get_d1(self); return f_boolcast(m_wday(dat) == 1); }
Returns the month in range (1..12):
Date.new(2001, 2, 3).mon # => 2
Date#month
is an alias for Date#mon
.
Returns a copy of self
with the given start
value:
d0 = Date.new(2000, 2, 3) d0.julian? # => false d1 = d0.new_start(Date::JULIAN) d1.julian? # => true
See argument start.
static VALUE d_lite_new_start(int argc, VALUE *argv, VALUE self) { VALUE vsg; double sg; rb_scan_args(argc, argv, "01", &vsg); sg = DEFAULT_SG; if (argc >= 1) val2sg(vsg, sg); return dup_obj_with_new_start(self, sg); }
Returns a new Date object representing the following day:
d = Date.new(2001, 2, 3) d.to_s # => "2001-02-03" d.next.to_s # => "2001-02-04"
Date#succ
is an alias for Date#next
.
static VALUE d_lite_next(VALUE self) { return d_lite_next_day(0, (VALUE *)NULL, self); }
Equivalent to Date#+
with argument n
.
static VALUE d_lite_next_day(int argc, VALUE *argv, VALUE self) { VALUE n; rb_scan_args(argc, argv, "01", &n); if (argc < 1) n = INT2FIX(1); return d_lite_plus(self, n); }
Equivalent to >>
with argument n
.
static VALUE d_lite_next_month(int argc, VALUE *argv, VALUE self) { VALUE n; rb_scan_args(argc, argv, "01", &n); if (argc < 1) n = INT2FIX(1); return d_lite_rshift(self, n); }
Equivalent to >>
with argument n * 12
.
static VALUE d_lite_next_year(int argc, VALUE *argv, VALUE self) { VALUE n; rb_scan_args(argc, argv, "01", &n); if (argc < 1) n = INT2FIX(1); return d_lite_rshift(self, f_mul(n, INT2FIX(12))); }
Equivalent to Date#-
with argument n
.
static VALUE d_lite_prev_day(int argc, VALUE *argv, VALUE self) { VALUE n; rb_scan_args(argc, argv, "01", &n); if (argc < 1) n = INT2FIX(1); return d_lite_minus(self, n); }
Equivalent to <<
with argument n
.
static VALUE d_lite_prev_month(int argc, VALUE *argv, VALUE self) { VALUE n; rb_scan_args(argc, argv, "01", &n); if (argc < 1) n = INT2FIX(1); return d_lite_lshift(self, n); }
Equivalent to <<
with argument n * 12
.
static VALUE d_lite_prev_year(int argc, VALUE *argv, VALUE self) { VALUE n; rb_scan_args(argc, argv, "01", &n); if (argc < 1) n = INT2FIX(1); return d_lite_lshift(self, f_mul(n, INT2FIX(12))); }
Equivalent to strftime
with argument '%a, %-d %b %Y %T %z'
; see Formats for Dates and Times:
Date.new(2001, 2, 3).rfc2822 # => "Sat, 3 Feb 2001 00:00:00 +0000"
Date#rfc822
is an alias for Date#rfc2822
.
static VALUE d_lite_rfc2822(VALUE self) { return strftimev("%a, %-d %b %Y %T %z", self, set_tmx); }
Equivalent to strftime
with argument '%FT%T%:z'
; see Formats for Dates and Times:
Date.new(2001, 2, 3).rfc3339 # => "2001-02-03T00:00:00+00:00"
static VALUE d_lite_rfc3339(VALUE self) { return strftimev("%Y-%m-%dT%H:%M:%S%:z", self, set_tmx); }
Returns a new Date object with values parsed from string
, which should be a valid RFC 2822 date format:
d = Date.new(2001, 2, 3) s = d.rfc2822 # => "Sat, 3 Feb 2001 00:00:00 +0000" Date.rfc2822(s) # => #<Date: 2001-02-03>
See:
-
Argument start.
-
Argument limit.
Date.rfc822
is an alias for Date.rfc2822
.
Related: Date._rfc2822
(returns a hash).
Returns true
if self
is a Saturday, false
otherwise.
static VALUE d_lite_saturday_p(VALUE self) { get_d1(self); return f_boolcast(m_wday(dat) == 6); }
Returns the Julian start date for calendar reform; if not an infinity, the returned value is suitable for passing to Date#jd
:
d = Date.new(2001, 2, 3, Date::ITALY) s = d.start # => 2299161.0 Date.jd(s).to_s # => "1582-10-15" d = Date.new(2001, 2, 3, Date::ENGLAND) s = d.start # => 2361222.0 Date.jd(s).to_s # => "1752-09-14" Date.new(2001, 2, 3, Date::GREGORIAN).start # => -Infinity Date.new(2001, 2, 3, Date::JULIAN).start # => Infinity
See argument start.
static VALUE d_lite_start(VALUE self) { get_d1(self); return DBL2NUM(m_sg(dat)); }
Calls the block with specified dates; returns self
.
-
The first
date
isself
. -
Each successive
date
isdate + step
, wherestep
is the numeric step size in days. -
The last date is the last one that is before or equal to
limit
, which should be a Date object.
Example:
limit = Date.new(2001, 12, 31) Date.new(2001).step(limit){|date| p date.to_s if date.mday == 31 }
Output:
"2001-01-31" "2001-03-31" "2001-05-31" "2001-07-31" "2001-08-31" "2001-10-31" "2001-12-31"
Returns an Enumerator
if no block is given.
static VALUE d_lite_step(int argc, VALUE *argv, VALUE self) { VALUE limit, step, date; int c; rb_scan_args(argc, argv, "11", &limit, &step); if (argc < 2) step = INT2FIX(1); #if 0 if (f_zero_p(step)) rb_raise(rb_eArgError, "step can't be 0"); #endif RETURN_ENUMERATOR(self, argc, argv); date = self; c = f_cmp(step, INT2FIX(0)); if (c < 0) { while (FIX2INT(d_lite_cmp(date, limit)) >= 0) { rb_yield(date); date = d_lite_plus(date, step); } } else if (c == 0) { while (1) rb_yield(date); } else /* if (c > 0) */ { while (FIX2INT(d_lite_cmp(date, limit)) <= 0) { rb_yield(date); date = d_lite_plus(date, step); } } return self; }
Returns a string representation of the date in self
, formatted according the given format
:
Date.new(2001, 2, 3).strftime # => "2001-02-03"
For other formats, see Formats for Dates and Times.
static VALUE d_lite_strftime(int argc, VALUE *argv, VALUE self) { return date_strftime_internal(argc, argv, self, "%Y-%m-%d", set_tmx); }
Returns a new Date object representing the following day:
d = Date.new(2001, 2, 3) d.to_s # => "2001-02-03" d.next.to_s # => "2001-02-04"
Returns true
if self
is a Sunday, false
otherwise.
static VALUE d_lite_sunday_p(VALUE self) { get_d1(self); return f_boolcast(m_wday(dat) == 0); }
Returns true
if self
is a Thursday, false
otherwise.
static VALUE d_lite_thursday_p(VALUE self) { get_d1(self); return f_boolcast(m_wday(dat) == 4); }
Returns self
.
static VALUE date_to_date(VALUE self) { return self; }
Returns a DateTime
whose value is the same as self
:
Date.new(2001, 2, 3).to_datetime # => #<DateTime: 2001-02-03T00:00:00+00:00>
static VALUE date_to_datetime(VALUE self) { get_d1a(self); if (simple_dat_p(adat)) { VALUE new = d_lite_s_alloc_simple(cDateTime); { get_d1b(new); bdat->s = adat->s; return new; } } else { VALUE new = d_lite_s_alloc_complex(cDateTime); { get_d1b(new); bdat->c = adat->c; bdat->c.df = 0; RB_OBJ_WRITE(new, &bdat->c.sf, INT2FIX(0)); #ifndef USE_PACK bdat->c.hour = 0; bdat->c.min = 0; bdat->c.sec = 0; #else bdat->c.pc = PACK5(EX_MON(adat->c.pc), EX_MDAY(adat->c.pc), 0, 0, 0); bdat->c.flags |= HAVE_DF | HAVE_TIME; #endif return new; } } }
Returns a string representation of the date in self
in ISO 8601 extended date format ('%Y-%m-%d'
):
Date.new(2001, 2, 3).to_s # => "2001-02-03"
static VALUE d_lite_to_s(VALUE self) { return strftimev("%Y-%m-%d", self, set_tmx); }
Returns a new Time
object with the same value as self
; if self
is a Julian date, derives its Gregorian date for conversion to the Time object:
Date.new(2001, 2, 3).to_time # => 2001-02-03 00:00:00 -0600 Date.new(2001, 2, 3, Date::JULIAN).to_time # => 2001-02-16 00:00:00 -0600
static VALUE date_to_time(VALUE self) { get_d1a(self); if (m_julian_p(adat)) { VALUE tmp = d_lite_gregorian(self); get_d1b(tmp); adat = bdat; } return f_local3(rb_cTime, m_real_year(adat), INT2FIX(m_mon(adat)), INT2FIX(m_mday(adat))); }
Returns true
if self
is a Tuesday, false
otherwise.
static VALUE d_lite_tuesday_p(VALUE self) { get_d1(self); return f_boolcast(m_wday(dat) == 2); }
Equivalent to step
with arguments max
and 1
.
static VALUE d_lite_upto(VALUE self, VALUE max) { VALUE date; RETURN_ENUMERATOR(self, 1, &max); date = self; while (FIX2INT(d_lite_cmp(date, max)) <= 0) { rb_yield(date); date = d_lite_plus(date, INT2FIX(1)); } return self; }
Returns the day of week in range (0..6); Sunday is 0:
Date.new(2001, 2, 3).wday # => 6
static VALUE d_lite_wday(VALUE self) { get_d1(self); return INT2FIX(m_wday(dat)); }
Returns true
if self
is a Wednesday, false
otherwise.
static VALUE d_lite_wednesday_p(VALUE self) { get_d1(self); return f_boolcast(m_wday(dat) == 3); }
Equivalent to strftime
with argument '%Y-%m-%d'
(or its shorthand form '%F'
);
Date.new(2001, 2, 3).iso8601 # => "2001-02-03"
Date#xmlschema
is an alias for Date#iso8601
.
Returns the day of the year, in range (1..366):
Date.new(2001, 2, 3).yday # => 34
static VALUE d_lite_yday(VALUE self) { get_d1(self); return INT2FIX(m_yday(dat)); }
Returns the year:
Date.new(2001, 2, 3).year # => 2001 (Date.new(1, 1, 1) - 1).year # => 0
static VALUE d_lite_year(VALUE self) { get_d1(self); return m_real_year(dat); }