**Time calculator :-** (+) add or (-) subtract (time duration, time difference):

Time Calculator in Expression. Use this calculator to add or subtract two or more time values in the form of an expression. ... Like other numbers, time can be added or subtracted. However, due to how time is defined, there exist differences in how calculations must be computed when compared to decimal numbers.

Use this calculator to add or subtract time (days, hours, minutes, seconds) from a starting time and date. The result will be the new time and date based on the subtracted or added period of time. To calculate the amount of time (days, hours, minutes, seconds) between times on two different dates