The other day at work I stumbled upon this bug and thought it was worth to write a blog post about. Spoiler: It has nothing to do with timezones!
TLDR: According to ISO standard 8601 (which is what Python’s date.isocalendar().week uses for example), the first week of the year is the week with the first Thursday of the year. So sometimes the first few days of January belong to the last week of previous year, and sometimes the last few days of December belong to the first week of next year :D
I’m just curious how this works in practice.
When you say something like “Let’s meet up this weekend”, is it implied that you will meet on Saturday, since Sunday is the other end of next week, so technically a different weekend?
Not quite sure actually, I think we end up specifying a day or implicitly consider both of them