Add Or Subtract Weeks, Days, Hours, Minutes, Seconds
60 seconds === 1 minute
The decimal measuring system uses 100 to advance from centimeters to Meters and 1,000 to advance to Kilometers.
The process of adding and subtracting time uses a multi-base system of 60, 60, 24 and 7 to move from seconds through weeks.
To do a calculation follow the following steps :-
See also :