Unrelated, but not much, see how Office/Excel WEEKDAY has parameters for the starting day (and numbering starting from 0 or from 1): https://support.microsoft.

Unrelated, but not much, see how Office/Excel WEEKDAY has parameters for the starting day (and numbering starting from 0 or from 1): https://support.microsoft.com/en-us/office/weekday-function-60e44483-2ed1-439f-8bd0-e404c190949a https://support.microsoft.com/en-us/office/weekday-function-...