Time Duration Add/Subtract Calculator

Move a date and time forward or backward by any number of hours and minutes—for travel, schedules, deadlines, or reminders.

This uses the time zone set on your device.
Operation
Large values are allowed.
Values over 60 are normalized automatically.

How to use this calculator

Pick a starting date and time, choose add or subtract, and enter the duration. Minutes do not need to be converted first: 90 minutes becomes 1 hour 30 minutes.

What this means

The result applies the duration as elapsed time. If a daylight saving change occurs during the interval, the local clock can skip forward or repeat an hour even though the elapsed duration remains exact.