Contents

module Hijri
  class Date

    include Comparable

    attr_accessor :day, :month, :year
    MONTHNAMES_EN = %w(Muharram Safar Rabia-Awwal Rabia-Thani Jumaada-Awal Jumaada-Thani Rajab Sha'ban Ramadan Shawwal Dhul-Qi'dah Dhul-Hijjah)
    DAYNAMES = %w(as-Sabt al-Ahad al-Ithnayn ath-Thalaathaa al-Arba'aa' al-Khamis al-Jumu'ah)

    class << self
      def today
        date = ::Date.today
        date.to_hijri
      end
    end

    def initialize(year=1, month=1, day=1)
       @year, @month, @day = year, month, day
    end

    def islamic_leap_year?
      return (((((11 * self.year) + 14) % 30) < 11) ? true : false)
    end

    def last_day_of_islamic_month
      # Last day in month during year on the Islamic calendar.
      return ((self.month % 2 == 1) || (self.month == 12 && islamic_leap_year?) ? 30 : 29)
    end

    def to_s
      "#{@year}-#{sprintf('%02d', @month)}-#{sprintf('%02d', @day)}"
    end

    def <=>(date)
      # Make sure the date is a Hijri::Date instance
      date = date.to_hijri
      if self.to_s == date.to_s
        return 0
      elsif @year > date.year || (@year == date.year && @month > date.month) || (@year == date.year && @month == date.month && @day > date.day)
        return 1
      else
        return -1
      end
    end

    def to_abs
      month_days = 29 * (month - 1) # days on this year
      nonleap_year_days  = 354 * (year - 1)
      leap_year_days = (3 + (11 * year)) / 30.0
      this_year  = (month / 2.0).to_i

      return (day + month_days + this_year + nonleap_year_days + leap_year_days + Hijri::ISLAMIC_EPOCH).to_i
    end

    def to_greo
      ::Date.new *Converter.hijri_to_greo(self)
    end

    # Just to have a consistent Interface.
    def to_hijri
      self
    end

  end
end

Version data entries

1 entries across 1 versions & 1 rubygems

Version	Path
hijri-0.2.5	lib/hijri/date.rb