Calculate the end time from the start time and elapsed time.

The time after(before) the elapsed time from the start time and the elapsed time is calculated.

When the start time and the elapsed time are input, "The after" or "Time before" is selected, and "Calculate time" button is clicked, The time after or before the elapsed time from the start time is calculated and displayed.

The elapsed time can be entered, such as 2000 seconds and 100 minutes.