Why does YYYY exist? Is there some common need I'm not familiar with?
Also, I clicked on the title because I wanted to know what format Yyyy was... I feel mislead.
Also, I clicked on the title because I wanted to know what format Yyyy was... I feel mislead.
YYYY is for ISO week-years e.g. December 30, 2024 was also W01 2025 in the ISO calendar. Similarly January 1st 2027 will be W53 2026.
ISO weeks are in common use in Europe.
In some countries (EU?) things get counted towards tax years based on it. It's probably useful for accounting software.