Leap or mechanics preceder(7)
You may think that Leap Day is 
added to the calendar every four years, creating a Leap Year,... [DOC] [TLE] Leap week calendar - Wikipedia [PAR] A leap week calendar is a calendar system with a whole number of weeks every 
year, and with ... A year with an intercalary/leap week is at least 7 days longer 
than a year without an intercalary week.