A leap year is a calendar year that has an extra day ... Consider adding this historical fact to your list of trivia questions: After Pope Gregory XIII instituted the Gregorian calendar, the ...

Every fourth year, those extra quarter-days get added to the calendar to make one full day – February 29. 2 This means every leap year has 366 days! 3 A leap year happens when the year can be ...

A lot of annoying little hacks are needed to keep our integer-based calendar ... leap day, passed us by this week. Aside from the ignominy of adding a day to what’s already the worst month of ...