Frequently Asked Questions

Q: Why do I see a 53rd week on my week based reports?

A: The ISO date standards dictate that weeks start on their Mondays and the year that they belong to is given by the year in which their Thursday falls. As a result, there are certain years that have a 53rd week. For example, since 2020 was a leap year and started on a Wednesday, there are 53 weeks in 2020. 2015 was not a leap year, but Jan 1, 2015 fell on a Thursday and therefore has 53 weeks. In general, any regular year that starts on a Thursday, and any leap year that starts on a Wednesday will have 53 weeks. Here are the years between 1970 and 2050 where you will encounter this:

1970
1971
1976
1977
1981
1982
1987
1988
1992
1993
1998
1999
2004
2005
2009
2010
2015
2016
2020
2021
2026
2027
2032
2033
2037
2038
2043
2044
2048
2049

 

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