Most leap week calendars take advantage of the fact that 400 Gregorian Calendar years have exactly 20,871 weeks, so with common years of 52 weeks, this means there are 71 leap weeks every 400 years.
400 Gregorian Calendar years have exactly 20,871 weeks. Most leap week calendars take advantage of the fact this. This means. This is with common years of 52 weeks. There are 71 leap weeks every 400 years.