| Christian Calendar |
Julian: to 1582-10-04, Gregorian: from 15. Oct 1582; Year 0: NO (..., -2, -1, 1, 2, ...)
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| Julian Calendar |
Valid: from 1. Jan 45 BC to 4. Oct 1582; proleptic: before and after; Year 0: NO (..., -2, -1, 1, 2, ...);
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| Gregorian Calendar |
Valid: from 15. Oct 1582; proleptic: before 1582-10-15; Year 0: YES (..., -2, -1, 0, 1, 2, ...);
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| Javascript Calendar |
Same as Gregorian Calendar; months 0..11
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