45 BC

The year 45 BC (in the proleptic Julian calendar) started on Friday, January 1, and ended on Saturday, December 31. It was (proleptically) a leap year. On Friday, January 1, the Julian calendar was introduced.

Calendar with holidays
Holidays:
 * New Year's Day: Friday, January 1
 * Leap Day: Monday, February 29
 * Halloween: Monday, October 31
 * New Year's Eve: Saturday, December 31