Please use ISO 8601 for your dates in files

Published on 2026-06-24

opinion

It's not that hard to switch and easier for everyone - including me especially

tl;dr: When you need to state the date, just use YYYY-MM-DD.

ISO 8601 is pretty simple: Date is YYYY-MM-DD and time is HH:MM. Please use it. Benefits include:

  1. Automatic sorting through names. I don’t get how people are NOT annoyed with Jan appearing after Apr in their file lists. Stop. Just use 2026-01-01 and you will always see it before 2026-04-01 unless you sort by other means.
  2. Understandable by anyone. 02-12-2026 can either mean February 12 or December 2. Stop the confusion and use either 2026-12-02 or 2026-02-12.
  3. Automatic versioning. If you add hours and minutes (even as HH-MM), it’s not that hard to think of the next version because you can just use the time you save the file.

Before people tell me that the date is in the metadata, I would really like to say that zipping it or uploading it somewhere can change it. Not to mention a random stray save can ruin your day.

Please, it’s not that hard. Just use ISO 8601 for your dates. Stop the other formats.