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The final quarter has 14 weeks in it when there are 53 weeks in the year. When it is necessary to allocate a week to a single month, the rule for first week of the year might be applied, although ISO 8601-1 does not consider this case explicitly. The resulting pattern would be irregular.
A leap week calendar can take advantage of the 400-year cycle of the Gregorian calendar, as it has exactly 20,871 weeks: with 329 common years of 52 weeks plus 71 leap years of 53 weeks, a leap week calendar would synchronize with the Gregorian every 400 years since (329 × 52 + 71 × 53 = 20,871).
A variation is the 52–53-week calendar. It is used by companies that want their fiscal year to always end on the same day of the week. Any day of the week may be used, and Saturday and Sunday are common because the business may more easily be closed for counting inventory and other end-of-year accounting activities.
Broadcast calendar years can have either 52 or 53 weeks. A broadcast calendar will have 53 weeks in a leap year where January 1 falls on a Saturday or Sunday, or in a common year where January 1 falls on a Sunday. In the 21st century, 53-week broadcast calendar years are 2006, 2012, 2017, 2023, 2028, 2034, 2040, 2045, 2051, 2056, 2062, 2068 ...
The week number can be described by counting the Thursdays: week 12 contains the 12th Thursday of the year. The ISO week-numbering year starts at the first day (Monday) of week 01 and ends at the Sunday before the new ISO year (hence without overlap or gap). It consists of 52 or 53 full weeks. The first ISO week of a year may have up to three ...
The 52–53-week fiscal year (or 4–4–5 calendar) is used by companies that desire that their fiscal year always end on the same day of the week.Any day of the week may be used, and Saturday and Sunday are common because the business may more easily be closed for counting inventory and other end-of-year accounting activities.
For this kind of year, the corresponding ISO year has 53 weeks, and the ISO week 10 (which begins March 1) and all subsequent ISO weeks occur earlier than in all other years, and exactly one week earlier than common years starting on Friday, for example, June 20 falls on week 24 in common years starting on Friday, but on week 25 in leap years ...
Forty-four common years per cycle or exactly 11% start on a Thursday. The 28-year sub-cycle only spans across century years divisible by 400, e.g. 1600, 2000, and 2400. This type of year has 53 weeks in the week-day format of the ISO 8601 standard.