just to laugh

tried this with MS SQL

select DATEPART(wk, '20210101')
select DATEPART(wk, '20210102')
select DATEPART(wk, '20210103')
select DATEPART(wk, '20210104')
select DATEPART(wk, '20210105')
select DATEPART(wk, '20210106')

result

1
1
2
2
2
2

https://en.wikipedia.org/wiki/ISO_8601#Week_dates


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