Gregorian calendar reform date: October 15, 1582 (JD)
The Gregorian calendar was adopted on October 15, 1582 (Gregorian),
which was October 4, 1582 in the Julian calendar (10 days were skipped).
Dates before this should use Julian calendar rules, after this use Gregorian.
Gregorian calendar reform date: October 15, 1582 (JD)
The Gregorian calendar was adopted on October 15, 1582 (Gregorian), which was October 4, 1582 in the Julian calendar (10 days were skipped). Dates before this should use Julian calendar rules, after this use Gregorian.