Can I add negative time?

Yes, negative values subtract from the total duration.

Date & Time

Time Calculator

Do arithmetic on time durations without manual conversion.

Time A (hh:mm:ss)

Time B (hh:mm:ss)

Result

02:15:15

Do arithmetic on time durations without manual conversion.

Everything runs directly in your browser. No signup, no upload, no tracking of your inputs - just a fast, focused utility that respects your time.

Convert between Unix timestamps and human-readable dates.