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