@dasrecht@OdyX If you want your head to really hurt, you can look at the concept of week numbers, with some extra fun depending on whether one uses the Gregorian calendar or one follows the ISO 8601 standard (https://en.wikipedia.org/wiki/ISO_week_date).
@CyrilBrulebois@OdyX oh gosh - i remember a snafu a few years back because US and EMEA teams had an off by one as our team operates on week numbers for the release trains 😅