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Definition
There are
| Name | Description |
|---|---|
| Basic/None | Must be corrected for all months less than 31 days. The cheapest, as it always just counts to 31. |
| Annual calendar | Handles 30 & 31-day months, must be corrected once per year for Februrary. |
| Perpetual | Correct for 4 years, must be corrected for leap years. |
| Secular calendar | Correct for 100 years or more, handles leap years. |
