37 BC

The year 37 BC (in the proleptic Julian calendar) started on Monday, January 1, and ended on Tuesday, December 31. It was (proleptically) a leap year.

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