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# date2.rb: Written by Tadayoshi Funaba 1998, 1999
# $Id: date2.rb,v 1.13 1999/08/11 01:10:02 tadf Exp $
class Date
include Comparable
MONTHNAMES = [ nil, 'January', 'February', 'March',
'April', 'May', 'June', 'July', 'August',
'September', 'October', 'November', 'December' ]
DAYNAMES = [ 'Sunday', 'Monday', 'Tuesday',
'Wednesday', 'Thursday', 'Friday', 'Saturday' ]
ITALY = 2299161 # Oct 15, 1582
ENGLAND = 2361222 # Sept 14, 1752
class << self
def os? (jd, sg)
case sg
when Numeric; jd < sg
else; not sg
end
end
def ns? (jd, sg) not os?(jd, sg) end
def civil_to_jd(y, m, d, sg=true)
if m <= 2
y -= 1
m += 12
end
a = (y / 100).to_i
b = 2 - a + (a / 4).to_i
jd = (365.25 * (y + 4716)).to_i +
(30.6001 * (m + 1)).to_i +
d + b - 1524
if os?(jd, sg)
jd -= b
end
jd
end
def jd_to_civil(jd, sg=true)
if os?(jd, sg)
a = jd
else
x = ((jd - 1867216.25) / 36524.25).to_i
a = jd + 1 + x - (x / 4).to_i
end
b = a + 1524
c = ((b - 122.1) / 365.25).to_i
d = (365.25 * c).to_i
e = ((b - d) / 30.6001).to_i
dom = b - d - (30.6001 * e).to_i
if e <= 13
m = e - 1
y = c - 4716
else
m = e - 13
y = c - 4715
end
return y, m, dom
end
def ordinal_to_jd(y, d, sg=true)
civil_to_jd(y, 1, d, sg)
end
def jd_to_ordinal(jd, sg=true)
y = jd_to_civil(jd, sg)[0]
pl = civil_to_jd(y - 1, 12, 31, ns?(jd, sg))
doy = jd - pl
return y, doy
end
def mjd_to_jd(mjd) mjd + 2400000.5 end
def jd_to_mjd(jd) jd - 2400000.5 end
def tjd_to_jd(tjd) tjd + 2440000.5 end
def jd_to_tjd(jd) jd - 2440000.5 end
def julian_leap? (y) y % 4 == 0 end
def gregorian_leap? (y) y % 4 == 0 and y % 100 != 0 or y % 400 == 0 end
alias_method :leap?, :gregorian_leap?
def exist3? (y, m, d, sg=ITALY)
if m < 0
m += 13
end
if d < 0
ljd = nil
31.downto 1 do |ld|
break if ljd = exist3?(y, m, ld, sg)
end
x = y * 12 + m
ny = x / 12
nm = x % 12 + 1
d = jd_to_civil(civil_to_jd(ny, nm, 1, ns?(ljd, sg)) + d,
ns?(ljd, sg))[-1]
end
jd = civil_to_jd(y, m, d, sg)
if [y, m, d] == jd_to_civil(jd, sg)
jd
end
end
alias_method :exist?, :exist3?
def new3(y=-4712, m=1, d=1, sg=ITALY)
unless jd = exist3?(y, m, d, sg)
fail ArgumentError, 'invalid date'
end
new(jd, sg)
end
def exist2? (y, d, sg=ITALY)
if d < 0
ljd = nil
366.downto 1 do |ld|
break if ljd = exist2?(y, ld, sg)
end
ny = y + 1
d = jd_to_ordinal(ordinal_to_jd(ny, 1, ns?(ljd, sg)) + d,
ns?(ljd, sg))[-1]
end
jd = ordinal_to_jd(y, d, sg)
if [y, d] == jd_to_ordinal(jd, sg)
jd
end
end
def new2(y=-4712, d=1, sg=ITALY)
unless jd = exist2?(y, d, sg)
fail ArgumentError, 'invalid date'
end
new(jd, sg)
end
def today(sg=ITALY)
new(civil_to_jd(*(Time.now.to_a[3..5].reverse << sg)), sg)
end
end
def initialize(jd=0, sg=ITALY) @jd, @sg = jd, sg end
def jd() @jd end
def mjd
def self.mjd() @mjd end
@mjd = Date.jd_to_mjd(@jd)
end
def tjd
def self.tjd() @tjd end
@tjd = Date.jd_to_tjd(@jd)
end
def civil
def self.year() @year end
def self.mon() @mon end
def self.month() @mon end
def self.mday() @mday end
def self.day() @mday end
@year, @mon, @mday = Date.jd_to_civil(@jd, @sg)
end
private :civil
def year
civil
@year
end
def yday
def self.yday() @yday end
@yday = Date.jd_to_ordinal(@jd, @sg)[-1]
@yday
end
def mon
civil
@mon
end
alias_method :month, :mon
def mday
civil
@mday
end
alias_method :day, :mday
def wday
def self.wday() @wday end
@wday = (@jd + 1) % 7
end
def os? () Date.os?(@jd, @sg) end
def ns? () Date.ns?(@jd, @sg) end
def leap?
def self.leap?() @leap_p end
@leap_p = Date.jd_to_civil(Date.civil_to_jd(year, 3, 1, ns?) - 1,
ns?)[-1] == 29
end
def + (other)
case other
when Numeric; return Date.new(@jd + other, @sg)
end
fail TypeError, 'expected numeric'
end
def - (other)
case other
when Numeric; return Date.new(@jd - other, @sg)
when Date; return @jd - other.jd
end
fail TypeError, 'expected numeric or date'
end
def <=> (other)
case other
when Numeric; return @jd <=> other
when Date; return @jd <=> other.jd
end
fail TypeError, 'expected numeric or date'
end
def downto(min)
@jd.downto(min.jd) do |jd|
yield Date.new(jd, @sg)
end
self
end
def upto(max)
@jd.upto(max.jd) do |jd|
yield Date.new(jd, @sg)
end
self
end
def step(limit, step)
@jd.step(limit.jd, step) do |jd|
yield Date.new(jd, @sg)
end
self
end
def succ() self + 1 end
alias_method :next, :succ
def eql? (other) self == other end
def hash() @jd end
def inspect() format('#<Date: %s,%s>', @jd, @sg) end
def to_s() format('%.4d-%02d-%02d', year, mon, mday) end
def _dump(limit) Marshal.dump([@jd, @sg], -1) end
def Date._load(str) Date.new(*Marshal.load(str)) end
end
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