Add or subtract time with date rollover
Add signed hours, minutes and seconds to a date and time without losing day changes.
Preparing your tool…
How it works
Add a signed duration to a UTC timestamp using fixed 24-hour days.
Example
2027-01-01T23:00:00Z plus 02:30:00 becomes 2027-01-02T01:30:00Z.
What should I check before using the result?
For local DST-aware elapsed calculations use the time duration tool.