The Time Calculator is a practical utility designed to perform arithmetic operations—specifically addition and subtraction—on time durations. This is a common task that can be surprisingly tricky to do manually due to the need to carry over or borrow across different units (seconds, minutes, and hours). This tool is perfect for tasks like calculating the total duration of a multi-part event, finding the time difference between a start and end time, or planning schedules. The calculator's interface is divided into three main sections. The first section, 'Time 1', is for your initial time value. Here, you can input the number of hours, minutes, and seconds. The third section, 'Time 2', is for the second time value you want to work with, also with fields for hours, minutes, and seconds. In between these two sections is a crucial dropdown menu where you select the 'Operation' you wish to perform. You can choose to either 'Add (+)' the two time values together or 'Subtract (-)' the second time value from the first. After you have entered both time durations and selected your operation, click the 'Calculate Time' button. The calculator will then compute the total duration. It correctly handles all the conversions; for example, if adding 45 minutes and 30 minutes, it knows the result is 1 hour and 15 minutes, not 75 minutes. The final result is displayed clearly in a standard h:m:s format. The tool can also handle negative results if you subtract a larger time from a smaller one.