How Date Difference is Calculated
The difference is calculated by subtracting the earlier date from the later date, then expressing it in multiple units for convenience.
Common Date Differences
| Period | Days |
|---|---|
| 1 week | 7 days |
| 1 month (avg) | 30.44 days |
| 1 quarter | 91.25 days |
| 1 year | 365 days (366 leap) |
| 1 decade | 3,652 days |