class Date

# File lib/hijri/gregorian.rb, line 6
def last_day_of_gregorian_month(month)
  # Compute the last date of the month for the Gregorian calendar.
  if month == 2
    return 29 if (self.year % 4 == 0 && self.year % 100 != 0) || (self.year % 400 == 0)
  end
  return [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31][month - 1]
end

# File lib/hijri/gregorian.rb, line 14
def to_abs
  @d = self.day
  @m = self.month - 1
  @m.downto(1) do |m|
    @d += last_day_of_gregorian_month(@m, year)
  end
  return (@d + 365 * (year - 1) + (year -1) / 4.0 - (year - 1) / 100.0 + (year - 1) / 400.0).to_i
end

# File lib/hijri/gregorian.rb, line 2
def to_hijri(adjust=0)
  Hijri::Date.new(*Hijri::Converter.greo_to_hijri(self + adjust))
end