class Time

def self.construct(year, month = 1, day = 1, hour = 0, minute = 0, second = 0)
  if second >= 60
    minute += second / 60
    second = second % 60
  end
  if minute >= 60
    hour += minute / 60
    minute = minute % 60
  end
  if hour >= 24
    day += hour / 24
    hour = hour % 24
  end
  # determine if there is a day overflow. this is complicated by our crappy calendar
  # system (non-constant number of days per month)
  day <= 56 || raise("day must be no more than 56 (makes month resolution easier)")
  if day > 28
    # no month ever has fewer than 28 days, so only do this if necessary
    leap_year = (year % 4 == 0) && !(year % 100 == 0)
    leap_year_month_days = [31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
    common_year_month_days = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
    days_this_month = leap_year ? leap_year_month_days[month - 1] : common_year_month_days[month - 1]
    if day > days_this_month
      month += day / days_this_month
      day = day % days_this_month
    end
  end
  if month > 12
    if month % 12 == 0
      year += (month - 12) / 12
      month = 12
    else
      year += month / 12
      month = month % 12
    end
  end
  Chronic.time_class.local(year, month, day, hour, minute, second)
end

def to_minidate
  Chronic::MiniDate.new(self.month, self.day)
end