C# Compare Time between Two Time Intervals

Question

Trying to compare a given Time between two times to see if it\'s within the those intervals. e.g. if given Time is 00:00 I need to find out if it falls between 21:00:00 to

Answer 1

The following code...

static class DateTimeExt {

    public static bool TimeOfDayIsBetween(this DateTime t, DateTime start, DateTime end) {

        var time_of_day = t.TimeOfDay;
        var start_time_of_day = start.TimeOfDay;
        var end_time_of_day = end.TimeOfDay;

        if (start_time_of_day <= end_time_of_day)
            return start_time_of_day <= time_of_day && time_of_day <= end_time_of_day;

        return start_time_of_day <= time_of_day || time_of_day <= end_time_of_day;

    }

}

class Program {

    static void Test(DateTime t, DateTime start, DateTime end) {
        bool falls_within = t.TimeOfDayIsBetween(start, end);
        Console.WriteLine("{0} \t[{1},\t{2}]:\t{3}", t, start, end, falls_within);
    }

    static void Main(string[] args) {

        Test(new DateTime(2012, 1, 1, 0, 0, 0), new DateTime(2012, 1, 1, 7, 0, 0), new DateTime(2012, 1, 1, 19, 0, 0));
        Test(new DateTime(2012, 1, 1, 1, 0, 0), new DateTime(2012, 1, 1, 7, 0, 0), new DateTime(2012, 1, 1, 19, 0, 0));

        Test(new DateTime(2012, 1, 1, 0, 0, 0), new DateTime(2012, 1, 1, 19, 0, 0), new DateTime(2012, 1, 1, 21, 0, 0));
        Test(new DateTime(2012, 1, 1, 1, 0, 0), new DateTime(2012, 1, 1, 19, 0, 0), new DateTime(2012, 1, 1, 21, 0, 0));

        Test(new DateTime(2012, 1, 1, 0, 0, 0), new DateTime(2012, 1, 1, 21, 0, 0), new DateTime(2012, 1, 1, 7, 0, 0));
        Test(new DateTime(2012, 1, 1, 1, 0, 0), new DateTime(2012, 1, 1, 21, 0, 0), new DateTime(2012, 1, 1, 7, 0, 0));

        Test(new DateTime(2012, 05, 17, 00, 00, 00, 00), new DateTime(2012, 05, 17, 20, 00, 00), new DateTime(2012, 05, 18, 08, 00, 00));
        Test(new DateTime(2012, 05, 17, 09, 00, 00, 00), new DateTime(2012, 05, 17, 20, 00, 00), new DateTime(2012, 05, 18, 08, 00, 00));

        Test(new DateTime(2012, 1, 1, 0, 0, 0), new DateTime(2012, 1, 1, 0, 0, 0), new DateTime(2012, 1, 1, 0, 0, 0));

    }

}

...prints the following result:

1/1/2012 12:00:00 AM    [1/1/2012 7:00:00 AM,   1/1/2012 7:00:00 PM]:   False
1/1/2012 1:00:00 AM     [1/1/2012 7:00:00 AM,   1/1/2012 7:00:00 PM]:   False
1/1/2012 12:00:00 AM    [1/1/2012 7:00:00 PM,   1/1/2012 9:00:00 PM]:   False
1/1/2012 1:00:00 AM     [1/1/2012 7:00:00 PM,   1/1/2012 9:00:00 PM]:   False
1/1/2012 12:00:00 AM    [1/1/2012 9:00:00 PM,   1/1/2012 7:00:00 AM]:   True
1/1/2012 1:00:00 AM     [1/1/2012 9:00:00 PM,   1/1/2012 7:00:00 AM]:   True
5/17/2012 12:00:00 AM   [5/17/2012 8:00:00 PM,  5/18/2012 8:00:00 AM]:  True
5/17/2012 9:00:00 AM    [5/17/2012 8:00:00 PM,  5/18/2012 8:00:00 AM]:  False
1/1/2012 12:00:00 AM    [1/1/2012 12:00:00 AM,  1/1/2012 12:00:00 AM]:  True