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Dates
Thyme does not account for historical date fluctuations that would not follow logic.

In 1582, Pope Gregory XIII changed our calendar so that every year that is divisble by 100 is not a leap year unless it is also divisble by 400. This is the standard we have adopted today. In years before 1582 any year divisible by 4 was a leap year. Thyme does not account for this historical fluxuation and uses the same standard we use today. For example, it displays 1500 as a leap year, even though, historically this was not correct.

Pope Gregory XIII also skipped 10 days to account for his new rule. Historically, October 4th 1582 was followed by October 15th.

Though these date fluctuations are historically correct, they are not mathmatically desireable. It would not be logical if you told your calendar to advance 1 day from October 4th 1582 and you ended up with October 15th 1582.

For these reasons, this method of dealing with dates is the standard for Thyme and most other software.