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Time Duration Calculator
Enter earlier or start time information at "From:"
Enter later or end time information at "To:"
Enter hours, minutes and seconds. Select am or pm.
The hours entered must be a positive number between 1 and 12 or zero (0).
The minutes entered must be a positive number between 1 and 59 or zero (0).
The seconds entered must be a positive number between 1 and 59 or zero (0).
Click "Click to Calculate" button. The number of hours, minutes and seconds between the two selected times will appear.
NaN = not a number
To clear the entry boxes click "Reset".
Clock Math Calculator
From a selected clock time, add or subtract hours, minutes and seconds
Enter clock time information at "From:"
Enter hours and minutes. Select am or pm.
Enter the number of hours, minutes and seconds you wish to add to or subtract from the clock time.
Select "add" or "subtract"
Click "Click to Calculate" button. The calculated clock time will appear.
To clear the entry boxes click "Reset".