128
January 1st is not always on the first week of the year (www.jpvalencia.com)
submitted 2 days ago by null4141@programming.dev to c/programming@programming.dev
42 comments fedilink hide all child comments

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

you are viewing a single comment's thread
view the rest of the comments
[-] locuester@lemmy.zip 1 points 23 hours ago

The weekend, and more specifically “this weekend” or “this coming weekend” means both days - Saturday and Sunday.

Sunday being a part of next week on a written calendar does not even register as a potential date “problem” with my brain in day-to-day talk.

this post was submitted on 24 Mar 2026
128 points (97.8% liked)

Programming

26232 readers
250 users here now

Welcome to the main community in programming.dev! Feel free to post anything relating to programming here!

Cross posting is strongly encouraged in the instance. If you feel your post or another person's post makes sense in another community cross post into it.

Hope you enjoy the instance!

Rules

Rules

  • Follow the programming.dev instance rules
  • Keep content related to programming in some way
  • If you're posting long videos try to add in some form of tldr for those who don't want to watch videos

Wormhole

Follow the wormhole through a path of communities !webdev@programming.dev

founded 2 years ago
MODERATORS
snowe@programming.dev
Ategon@programming.dev
UlrikHD@programming.dev
bugsmith@programming.dev
Spyro@programming.dev