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# date.rb: Written by Tadayoshi Funaba 1998
# $Id: date.rb,v 1.4 1998/06/01 12:52:33 tadf Exp $
class Date
include Comparable
MONTHNAMES = [ '', '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
def Date.civil_to_jd(y, m, d, gs = true)
if m <= 2 then
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
unless
(if gs.kind_of? Numeric then jd >= gs else gs end) then
jd -= b
end
jd
end
def Date.jd_to_civil(jd, gs = true)
unless
(if gs.kind_of? Numeric then jd >= gs else gs end) then
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 then
m = e - 1
y = c - 4716
else
m = e - 13
y = c - 4715
end
return y, m, dom
end
def Date.mjd_to_jd(mjd)
mjd + 2400000.5
end
def Date.jd_to_mjd(jd)
jd - 2400000.5
end
def Date.tjd_to_jd(tjd)
tjd + 2440000.5
end
def Date.jd_to_tjd(jd)
jd - 2440000.5
end
def Date.julian_leap? (y)
y % 4 == 0
end
def Date.gregorian_leap? (y)
y % 4 == 0 and y % 100 != 0 or y % 400 == 0
end
def Date.leap? (y)
Date.gregorian_leap?(y)
end
def initialize(jd = 0, gs = ITALY)
@jd, @gs = jd, gs
end
def Date.exist? (y, m, d, gs = true)
jd = Date.civil_to_jd(y, m, d, gs)
if [y, m, d] == Date.jd_to_civil(jd, gs) then
jd
end
end
def Date.new3(y = -4712, m = 1, d = 1, gs = ITALY)
unless jd = Date.exist?(y, m, d, gs) then
fail ArgumentError, 'invalid date'
end
Date.new(jd, gs)
end
def Date.today(gs = ITALY)
Date.new(Date.civil_to_jd(*(Time.now.to_a[3..5].reverse << gs)), gs)
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.mday; @mday end
@year, @mon, @mday = Date.jd_to_civil(@jd, @gs)
end
private :civil
def year
civil
@year
end
def yday
def self.yday; @yday end
ns = if @gs.kind_of? Numeric then @jd >= @gs else @gs end
jd = Date.civil_to_jd(year - 1, 12, 31, ns)
@yday = @jd - jd
end
def mon
civil
@mon
end
def mday
civil
@mday
end
def wday
def self.wday; @wday end
@wday = (@jd + 1) % 7
end
def leap?
def self.leap?; @leap_p end
ns = if @gs.kind_of? Numeric then @jd >= @gs else @gs end
jd = Date.civil_to_jd(year, 2, 28, ns)
@leap_p = Date.jd_to_civil(jd + 1, ns)[1] == 2
end
def + (other)
if other.kind_of? Numeric then
return Date.new(@jd + other, @gs)
end
fail TypeError, 'expected numeric'
end
def - (other)
if other.kind_of? Numeric then
return Date.new(@jd - other, @gs)
elsif other.kind_of? Date then
return @jd - other.jd
end
fail TypeError, 'expected numeric or date'
end
def <=> (other)
if other.kind_of? Numeric then
return @jd <=> other
elsif other.kind_of? Date then
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, @gs)
end
end
def upto(max)
@jd.upto(max.jd) do |jd|
yield Date.new(jd, @gs)
end
end
def step(max, step)
@jd.step(max.jd, step) do |jd|
yield Date.new(jd, @gs)
end
end
def eql? (other)
self == other
end
def hash
@jd
end
def to_s
format('%04d-%02d-%02d', year, mon, mday)
end
end
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