How to use it
Use this calculator to combine logged durations, subtract time budgets, or normalize component totals.
- Enter two non-negative durations using days, hours, minutes, and seconds.
- Choose addition or subtraction and calculate.
- Review the signed normalized duration and exact total seconds.
Worked example
- Input
1d 23h 59m 50s + 15s
- Output
2d 00h 00m 05s · 172,805 seconds
A negative subtraction keeps its sign and normalizes the absolute components.
Method and definitions
- Each input becomes days × 86,400 + hours × 3,600 + minutes × 60 + seconds.
- The signed total is divided back into normalized fixed-length components with exact integer arithmetic.
Limits and edge cases
- Hours must be 0–23 and minutes/seconds 0–59; days are fixed 24-hour periods.
- This is not calendar arithmetic and excludes dates, months, years, DST, leap seconds, and business time.
Privacy
Entries, dates, times, and results remain in this tab. Rigula does not upload them or add them to the URL.
Sources
