Question

At my work, we are on the 9/80 plan where we get every other Friday off. We’ve got a small program that shows a DevExpress.Scheduler control and I’d like to color our “Friday’s off” a different color. What I need to know is how do I know if a date is one of our Friday’s off? The Friday’s off will always be every other week (in other words, we don’t skip a week due to a holiday or something like that). I have the date of our First Friday off of the year, so I think I can use that somehow…I can also get the date from the scheduler as it’s drawn so I have something to compare to.

DateTime dtFirstFridayOff = new DateTime(2011, 1, 1);
DateTime dtCellDate = Convert.ToDateTime(e.Cell.Value);

Now I’m a bit lost as to how to check if dtCellDate is a Friday off.

Answer 1

    public static bool IsDateMultipleDays(DateTime originalDate, int numberOfDays, DateTime potentialDate)
    {
        var original = originalDate.Date; // to make sure that it doesn't have a time portion
        var potential = potentialDate.Date;
        var difference = potential - original;
        return (int)difference.TotalDays % numberOfDays == 0;
    }

Then you’d call it like this:

IsDateMultipleDays(dtFirstFridayOff, 14, dtCellDate)