Reference
| Unit | Seconds |
|---|---|
| 1 minute | 60 |
| 1 hour | 3,600 |
| 1 day | 86,400 |
| 1 week | 604,800 |
| 1 year (365.2425 days) | 31,556,952 |
Months and years use the average Gregorian length (a month is 30.44 days), so they are approximate for specific dates. For exact calendar calculations use the Date Difference Calculator; to convert timestamps, the Unix Timestamp Converter.
Frequently asked questions
How many hours are in a year?
About 8,766 hours on average (8,760 in a 365-day year).
Why are months approximate?
Months have 28 to 31 days, so an average length is used.
How many milliseconds in a minute?
60,000.