Directions

Time Duration Calculator
Enter earlier or start time information at "From:"
Enter later or end time information at "To:"
Enter hours and minutes. 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).
Click "Click to Calculate" button. The number of hours and minutes 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 and/or minutes
Enter clock time information at "From:"
Enter hours and minutes. Select am or pm.
Enter the number of hours and/or minutes you wish to add to or subtract from the clock time.
If the number of hours is greater than 24 hours, goto: Add or Subtract days, hours and minutes from an entered date and time
Select "add" or "subtract"
Click "Click to Calculate" button. The calculated clock time will appear.
To clear the entry boxes click "Reset".

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Time Duration Calculator - How many hours, minutes and seconds between two times

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