C# Program to Subtract Two TimeSpan

In C#, the TimeSpan structure represents a time interval and provides methods to perform arithmetic operations. To subtract one TimeSpan from another, you can use the Subtract() method or the subtraction operator (-).

Syntax

Following is the syntax for subtracting TimeSpan objects using the Subtract() method −

TimeSpan result = timeSpan1.Subtract(timeSpan2);

Following is the syntax using the subtraction operator −

TimeSpan result = timeSpan1 - timeSpan2;

Using Subtract() Method

The Subtract() method returns a new TimeSpan that represents the difference between two TimeSpan values −

using System;

public class Demo {
   public static void Main() {
      TimeSpan t1 = TimeSpan.FromMinutes(2);
      TimeSpan t2 = TimeSpan.FromMinutes(1);
      Console.WriteLine("First TimeSpan: " + t1);
      Console.WriteLine("Second TimeSpan: " + t2);
      
      // Subtracting using Subtract() method
      TimeSpan res = t1.Subtract(t2);
      Console.WriteLine("Resultant TimeSpan: " + res);
   }
}

The output of the above code is −

First TimeSpan: 00:02:00
Second TimeSpan: 00:01:00
Resultant TimeSpan: 00:01:00

Using Subtraction Operator

You can also use the subtraction operator (-) which provides a more concise syntax −

using System;

public class Demo {
   public static void Main() {
      TimeSpan startTime = new TimeSpan(10, 30, 0); // 10:30:00
      TimeSpan endTime = new TimeSpan(8, 15, 30);   // 08:15:30
      Console.WriteLine("Start Time: " + startTime);
      Console.WriteLine("End Time: " + endTime);
      
      // Subtracting using - operator
      TimeSpan duration = startTime - endTime;
      Console.WriteLine("Duration: " + duration);
   }
}

The output of the above code is −

Start Time: 10:30:00
End Time: 08:15:30
Duration: 02:14:30

Handling Negative Results

When the second TimeSpan is larger than the first, the result will be negative −

using System;

public class Demo {
   public static void Main() {
      TimeSpan smaller = TimeSpan.FromHours(1);
      TimeSpan larger = TimeSpan.FromHours(3);
      Console.WriteLine("Smaller TimeSpan: " + smaller);
      Console.WriteLine("Larger TimeSpan: " + larger);
      
      TimeSpan result = smaller - larger;
      Console.WriteLine("Result (negative): " + result);
      Console.WriteLine("Absolute value: " + result.Duration());
   }
}

The output of the above code is −

Smaller TimeSpan: 01:00:00
Larger TimeSpan: 03:00:00
Result (negative): -02:00:00
Absolute value: 02:00:00

Comparison

Conclusion

TimeSpan subtraction in C# can be performed using either the Subtract() method or the subtraction operator (-). Both approaches return a new TimeSpan representing the time difference, with negative results possible when subtracting a larger TimeSpan from a smaller one.