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#
# Date.rb -
# $Release Version: $
# $Revision: 1.2 $
# $Date: 1997/02/14 11:05:29 $
# by Yasuo OHBA(SHL Japan Inc. Technology Dept.)
#
# --
#
# September 1752
# S M Tu W Th F S
# 1 2 14 15 16
# 17 18 19 20 21 22 23
# 24 25 26 27 28 29 30
#
class Date
include Comparable
def initialize(y = 1, m = 1, d = 1)
if y.kind_of?(String) && y.size == 8
@year = y[0,4].to_i
@month = y[4,2].to_i
@day = y[6,2].to_i
else
if m.kind_of?(String)
ml = {"jan"=>1, "feb"=>2, "mar"=>3, "apr"=>4, "may"=>5, "jun"=>6, "jul"=>7, "aug"=>8, "sep"=>9, "oct"=>10, "nov"=>11, "dec"=>12}
m = ml[m.downcase]
if m.nil?
raise ArgumentError, "Wrong argument. (month)"
end
end
@year = y.to_i
@month = m.to_i
@day = d.to_i
end
_check_date
return self
end
def year
return @year
end
def month
return @month
end
def day
return @day
end
def period
return Date.period!(@year, @month, @day)
end
def day_of_week
dl = Date.daylist(@year)
d = Date.jan1!(@year)
for m in 1..(@month - 1)
d += dl[m]
end
d += @day - 1
if @year == 1752 && @month == 9 && @day >= 14
d -= (14 - 3)
end
return (d % 7)
end
Weektag = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"]
def name_of_week
return Weektag[self.day_of_week]
end
def +(o)
if o.kind_of?(Numeric)
d = Integer(self.period + o)
elsif o.kind_of?(Date)
d = self.period + o.period
else
raise TypeError, "Illegal type. (Integer or Date)"
end
return Date.at(d)
end
def -(o)
if o.kind_of?(Numeric)
d = Integer(self.period - o)
elsif o.kind_of?(Date)
return Integer(self.period - o.period)
else
raise TypeError, "Illegal type. (Integer or Date)"
end
if d <= 0
raise ArgumentError, "argument out of range. (self > other)"
end
return Date.at(d)
end
def <=>(o)
if o.kind_of?(Integer)
d = o
elsif o.kind_of?(Date)
d = o.period
else
raise TypeError, "Illegal type. (Integer or Date)"
end
return self.period <=> d
end
def eql?(o)
self == o
end
def hash
return @year ^ @month ^ @day
end
def leapyear?
if Date.leapyear(@year) == 1
return FALSE
else
return TRUE
end
end
def _check_date
m = Date.daylist(@year)
if @month < 1 || @month > 12
raise ArgumentError, "argument(month) out of range."
return nil
end
if @year == 1752 && @month == 9
if @day >= 3 && @day <= 13
raise ArgumentError, "argument(1752/09/3-13) out of range."
return nil
end
d = 30
else
d = m[@month]
end
if @day < 1 || @day > d
raise ArgumentError, "argument(day) out of range."
return nil
end
return self
end
private :_check_date
end
def Date.at(d)
if d.kind_of? Time
return Date.new(1900+d.year, d.mon, d.mday)
end
if d.kind_of? Date
return Date.at(d.period)
end
mm = 1
yy = (d / 366.0).to_i
if yy != 0
dd = d - (Date.period!(yy, 1, 1) - 1)
else
dd = d
yy = 1
end
dl = Date.daylist(yy)
while dd > dl[mm]
if dd > dl[0]
dd -= dl[0]
yy += 1
dl = Date.daylist(yy)
else
dd -= dl[mm]
mm += 1
end
end
if yy == 1752 && mm == 9 && dd >= 3 && dd <= 19
dd += (14 - 3) # 1752/09/03-19 -> 1752/09/14-30
end
return Date.new(yy, mm, dd)
end
def Date.period!(y, m, d)
p = d
dl = Date.daylist(y)
for mm in 1..(m - 1)
p += dl[mm]
end
p += (y - 1) * 365 + ((y - 1) / 4.0).to_i
if (y - 1) > 1752
p -= ((y - 1 - 1752) / 100.0).to_i
p += ((y - 1 - 1752) / 400.0).to_i
p -= (14 - 3)
elsif y == 1752 && m == 9 && d >= 14 && d <= 30
p -= (14 - 3)
end
return p
end
def Date.leapyear(yy)
return ((Date.jan1!(yy + 1) + 7 - Date.jan1!(yy)) % 7)
end
def Date.daylist(yy)
case (Date.leapyear(yy))
when 1 # non-leapyear
return [365, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
when 2 # leapyear
return [366, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
else # 1752
return [355, 31, 29, 31, 30, 31, 30, 31, 31, 19, 31, 30, 31]
end
end
def Date.jan1!(y)
d = 4 + y + (y + 3) / 4
if y > 1800
d -= (y - 1701) / 100
d += (y - 1601) / 400
end
if y > 1752
d += 3
end
return (d % 7)
end
|
