[robin_reala]

Have you ever been to any of Kazakhstan, Latvia, Nepal or Turkmenistan? https://en.wikipedia.org/wiki/Calendar_date#Gregorian.2C_yea...

[E-M]

I can assure you that Latvia does not use YYYY-DD-MM. Officially Latvia is using ISO 8601. https://en.wikipedia.org/wiki/ISO_8601#Usage

[robin_reala]

I’d update the Wikipedia article but don’t have time to go digging for official sources. Something you (or someone else with domain knowledge) could do?

[kbart]

I've been to Latvia many times in last few years, but haven't noticed YYYY-DD-MM format, maybe it's historical? It looks like DD.MM.YYYY was the most common format there (at least on posters).

[mixmastamyk]

Japan and Denmark use this format.