Calculating the time until a specific time of day

In order to calculate the time remaining before a specific time of day, .NET has a nice class called TimeSpan. With TimeSpan you can perform addition or subtraction on DateTime objects.

I ran into a situation where I needed to calculate the time remaining before it was 14:00. If it was 14:00 or greater, then I needed to calculate it for the following day.

The solution was pretty simple:

            DateTime now = DateTime.Now;
            DateTime target =
                new DateTime( DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Day, 14, 00, 00 );

            //Add 1 day to the target time if we're already at 14:00+ today.
            if ( now.Hour >= 14 )
                target = target.AddDays( 1 );

            TimeSpan difference = target - now;

            var timeRemain = difference.ToString( @"hh\:mm\:ss" );

The result is a nice string that looks similar to this:


Hope this helps someone looking for a similar solution!