This online calculator adds date components to a given date. It also produces the result for inverse operation (subtraction). Finally, using the calculator, you can change the time zone for the resulting date.
This is a generalized version of several date modification calculators listed on this site. In particular, this calculator can modify a given date by adding or subtracting the following date components:
Besides date and time arithmetic, the calculator can change the time zone of the input date to consider the time difference in the different corners of the planet.