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Note that this it a 1st attempt to organise all the calendars that may be included in the library. There may be name and code changes until they are fully implemented. Some calendars may be duplicated in this list under different names.

In Development

The following calendar variants are being considered.

Corrected Calendars

With some calendars, a particular authority is used to decide on the calendar elements and so a standard conversion is not possible. The Islamic observation calendar based on the appearance of the crescent moon is such a calendar.

It is possible to create a calendar accurate to within a day or two and this may be sufficient. But it may be possible, for instance, where the day of the week and calendar day is known, to improve the accuracy by adding a correction table.

Estimated Calendars

This is similar to the above, but where the error may be quite large and there is little hope of improvement. An example would be the early Roman calendar. In this variant, a series of ranges with a suggested error would be included. Dates would translate to a range, but would include a field so when translating back, the system knows to remove the error range.

Multi Calendars

A multi calendar is where two or more calendars are used together but unlike a hybrid calendar, they do not have to be similar. When formatting a multi-calendar, any element from any of the calendars may be used.