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

Or, if your needs go beyond that, use one of my favorites libraries.

Answer 2

You could write youself an extension method like;

public static class TimeExtensions
{
    public static bool IsBetween(this DateTime time, DateTime startTime, DateTime endTime)
    {
        if (time.TimeOfDay == startTime.TimeOfDay) return true;
        if (time.TimeOfDay == endTime.TimeOfDay) return true;

        if (startTime.TimeOfDay <= endTime.TimeOfDay)
            return (time.TimeOfDay >= startTime.TimeOfDay && time.TimeOfDay <= endTime.TimeOfDay);
        else
            return !(time.TimeOfDay >= endTime.TimeOfDay && time.TimeOfDay <= startTime.TimeOfDay);
    }
}

Answer 3

var time1 = DateTime.Now.TimeOfDay;
var time2 = DateTime.Now.AddDays(1.3).TimeOfDay;
var diff = time2 - time1;

So this is just for example perposes to show that adding 1.3 days still gives the same time answer.

Answer 4

Not sure why timespan is not working for you.

I tried this sample in my POC application and it worked.

 DateTime t1 = DateTime.Now;
    DateTime t2 = DateTime.UtcNow;
    t1.TimeOfDay.CompareTo(t2.TimeOfDay);

Try this hope it will solve the problem.

Answer 5

string dt=DateTime.Now.ToShortTimeString();
DateTime presenttime=Convert.ToDateTime(dt);

starttime = starttimepicker.ValueString;
DateTime dtime=Convert.ToDateTime(starttime);

if (dtime > presenttime)
{
   MessageBox.Show("Time cannot be greater than System Time. Please Try Again!", "Do not selecting future time", MessageBoxButton.OK);
            starttimepicker.Value = presenttime;
}

Answer 6

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