apex hour calc

    Public static hourCount TimeCalcHr(DateTime InputStart, Datetime InputEnd)
    {
        hourCount hours = new hourCount();

        Long secondsBetween = InputEnd.getTime() - InputStart.getTime();
        double totalHours = math.ceil(Integer.valueOf(secondsBetween / 60000 / 60));

        for(integer counter =0; counter <=  totalHours; counter++)
        {
            //some logic here to figure out of this hour is day or night
            boolean isDay = true;
            if(isDay)
            {
                hours.dayHours++;
            }
            else
            {
                hours.nightHours++;
            }
        }

        return hours;
    }