Add or subtract time
Shift any starting time forward or backward by a set number of hours and minutes, with clean handling of midnight roll-over in both directions.
Add or subtract time
Shift a time forward or back by any hours and minutes.
Add or subtract hours and minutes from a time
This is the tool for everyday time arithmetic: a departure plus a travel time, a deadline minus a buffer, a meeting pushed back an hour. Enter a starting time, pick add or subtract, and read the answer instantly.
Forward and backward
Subtracting works exactly like adding, in reverse. When a calculation crosses midnight — either into tomorrow or back into yesterday — Timesabout wraps the 24-hour clock and tells you how many days the result has moved.
Related calculators
To count from the present moment, use hours from now or minutes from now. Look back with hours ago.
Frequently asked
How do I add hours and minutes to a time?
Enter a starting time, choose Add, and type the hours and minutes to add. Timesabout returns the new time and notes if it lands on the next day.
How do I subtract time?
Choose Subtract instead of Add. The calculator counts backwards, rolling into the previous day when needed.
What happens when the result passes midnight?
The time wraps around the 24-hour clock and a small note shows how many days forward or back the result falls.