Time Duration Units & Calculator
These are fixed durations. Calendar months and years vary in length; local days can change during daylight-saving transitions. Use the calendar tools for civil date arithmetic.
Detailed explanation & worked examples
Conversion method
Base value = input × source factor + source offset. Output = (base value − target offset) ÷ target factor. Only units from this family can be converted together.
Worked example
For the first two units below: 1 Millisecond becomes 0.00100000 Second.
| Unit | Multiplier | Offset |
|---|---|---|
| Millisecond | 0.001 | 0 |
| Second | 1 | 0 |
| Minute | 60 | 0 |
| Hour | 3600 | 0 |
| Fixed 24-hour day | 86400 | 0 |
| Fixed 7-day week | 604800 | 0 |
These are fixed durations. Calendar months and years vary in length; local days can change during daylight-saving transitions. Use the calendar tools for civil date arithmetic.
NIST conversion factors · BIPM SI reference · Week-number explanation
Calculator builder · Calendar builder · All measurements · Date metrics
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