Sweden uses it. In informal situations you often see d/m but whenever a year is present it's always y-m-d. In fact people identify themselves using this format as part of the national ID numbers that are used for everything from healthcare to newspaper subscriptions.
In Sweden I've seen d/m-yy or d/m-yyyy used when a year is present, and I still use it when signing contracts, though I am starting to write the first letters of the month instead.
Sweden uses it. In informal situations you often see d/m but whenever a year is present it's always y-m-d. In fact people identify themselves using this format as part of the national ID numbers that are used for everything from healthcare to newspaper subscriptions.