C# - Duration between two DateTimes in minutes

Question

I need to determine duration between two DateTimes in minutes.

However, there is a slight twist:

• exclude weekends
• only count minutes which a

Answer 1

static int WorkPeriodMinuteDifference(DateTime start, DateTime end)
{
    //easier to only have to work in one direction.
    if(start > end)
        return WorkPeriodMinuteDifference(end, start);
    //if weekend, move to start of next Monday.
    while((int)start.DayOfWeek % 6 == 0)
        start = start.Add(new TimeSpan(1, 0, 0, 0)).Date;
    while((int)end.DayOfWeek % 6 == 0)
        end = end.Add(new TimeSpan(1, 0, 0, 0)).Date;
    //Move up to 07:00 or down to 19:00
    if(start.TimeOfDay.Hours < 7)
        start = new DateTime(start.Year, start.Month, start.Day, 7, 0, 0);
    else if(start.TimeOfDay.Hours > 19)
        start = new DateTime(start.Year, start.Month, start.Day, 19, 0, 0);
    if(end.TimeOfDay.Hours < 7)
        end = new DateTime(end.Year, end.Month, end.Day, 7, 0, 0);
    else if(end.TimeOfDay.Hours > 19)
        end = new DateTime(end.Year, end.Month, end.Day, 19, 0, 0);

    TimeSpan difference = end - start;

    int weeks = difference.Days / 7;
    int weekDays = difference.Days % 7;
    if(end.DayOfWeek < start.DayOfWeek)
        weekDays -= 2;

    return (weeks * 5 * 12 * 60) + (weekDays * 12 * 60) + difference.Hours * 60 + difference.Minutes
}