Exact Conversions
Seconds, minutes, hours, days, and weeks have fixed relationships: 60 seconds in a minute, 60 minutes in an hour, 24 hours in a day, 7 days in a week. These conversions are exact.
Approximate Conversions
Months and years are messier. Months range from 28 to 31 days. A year is about 365.25 days (accounting for leap years). Converting days to months or weeks to months always involves an approximation unless you name the exact months involved.
Reference Table
| From | To | Factor |
|---|---|---|
| 1 minute | seconds | 60 |
| 1 hour | minutes | 60 |
| 1 day | hours | 24 |
| 1 week | days | 7 |
| 1 year | days | ~365.25 |