1582

The year 1582 started on Monday, January 1 (in the Julian calendar), and ended on Friday, December 31 (in the Gregorian calendar). On Friday, October 15, the Gregorian calendar was introduced, with the preceding day being Thursday, October 4, in the Julian calendar.

Calendar with holidays
Holidays (Gregorian calendar only):
 * Halloween: Sunday, October 31
 * Christmas Eve: Friday, December 24
 * Christmas: Saturday, December 25
 * New Year's Eve: Friday, December 31