13 BC

The year 13 BC (in the proleptic Julian calendar) started on Wednesday, January 1, and ended on Thursday, December 31. It was (proleptically) a leap year.

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