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The ISO calendar in question is a variation of the [[Gregorian calendar]] that is used (mainly) in [[government]] and [[business]] for [[fiscal year]]s, as well as in timekeeping. In this system a year (ISO year) has 52 or 53 full weeks (364 or 371 days).
Leap week calendars vary on whether the concept of month is preserved and whether the month (if preserved) has a whole number of weeks. The [[Pax Calendar]], [[Hanke-Henry Permanent Calendar]] and [[Common-Civil-Calendar-and-Time|CCC&T]] preserve or modify the Gregorian month structure. The ISO week date
leap week calendars that eliminate the month.
Most leap week calendars take advantage of the 400-year cycle of the Gregorian calendar, having exactly 20,871 weeks. With 329 common years of 52 weeks, plus 71 leap years of 53 weeks, leap week calendars can synchronize with the Gregorian every 400 years. [(329 * 52) + (71 * 53) = 20,871]
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