DateTimeCalendarInternalStorage

This choice is about how to store data inside calendars.

Option 1 - year / month / day / hour / min / sec

This option would store data using the basic 6 fields. Unusual calendar systems would choose their own most important fields.

Advantages:

• get/set to any of these specific fields is very quick
• resolving invalid dates is obvious, as the leapyear/month/day combination is easy to check
• add of small amounts within stored fields is easy

Disadvantages:

• get/set to any other field is slow
• difficult to represent an object like !YearWeek (weekyear + week of year) as it doesn't fit
• add requires complex calculation

Option 2 - duration from epoch in seconds

This option would store data using seconds.

Advantages:

• get/set to all fields is calculated, those below day are quick
• add is quick for all fields except month/year
• able to represent any calendar, including ones like !YearWeek (weekyear + week of year)
• compareTo/equals/hashcode are quick
• conversion to an instant is quick

Disadvantages:

• get/set to all fields requires calculation
• resolving invalid dates requires calculation of each of year/month/day
• get/set day/month/year requires complex calculation
• add month/year requires complex calculation

Option 3 - duration from epoch in seconds and months

This option would store data using the 2 durations - seconds and months. Unusual calendar systems would choose their own fields (the ones with discontinuities).

Advantages:

• get/set to all fields is calculated, most calculations (esp. day/month/year) are quick
• add is quick for all fields (unless an unusual field is not based on a standard field)
• able to represent any calendar, including ones like !YearWeek (weekyear + week of year), eg. by storing 1 duration in weeks
• add month/year is quick

Disadvantages:

• get/set to all fields requires calculation, but this is quick
• resolving invalid dates requires calculation of each of year/month/day, but this is quick
• add fields below month requires potentially complex calculation if they go over 28 days

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