Add / Subtract Time
Add or subtract hours, minutes, and seconds from a time of day, with automatic wraparound at midnight. Free and private, right in your browser.
Enter a starting time, then add or subtract any number of hours and minutes to instantly get the resulting clock time - handy for figuring out shift end times, layover arrivals, cooking or medication schedules, or "what time will it be in 6 hours 45 minutes" without doing the math by hand.
How to use it
- Enter your starting time
- Choose add or subtract and enter hours/minutes to shift by
- Read the resulting clock time instantly
Frequently asked questions
- Does this account for AM/PM and midnight rollover?
- Yes. If adding or subtracting time crosses midnight, the result automatically wraps to the correct time and shows whether it lands on the next or previous day.
- Can I subtract time instead of adding it?
- Yes, just switch to subtract mode (or enter a negative value) and it will calculate the earlier time the same way.
- What format does the result show?
- You'll get both 12-hour (AM/PM) and 24-hour clock formats, so you can use whichever matches your schedule, timesheet, or system.
- 1
Nothing is uploaded
The file never leaves your device. There is no server to send it to, so there is nothing to leak, log, or subpoena.
- 2
No signup, no limits
No account, no email, no daily cap, no watermark, and no paid tier waiting behind the third file.
- 3
Works offline
Load the page once and it keeps working with the network off, because all the work was always happening locally.