[tom-jh]

I use the 2021-02-26 format for every place that asks for a date without a clear format. All legal contracts, forms, email etc, across US and Europe. Never got any trouble for it - it seems people readily understand the format even if they may think it's a bit unusual.

I wish it was the norm.

[SecurityLagoon]

Yeah, I deal with so many different countries that it is a minefield using any other date format than RFC3339/ISO8601. I have been stung by having my birthday month and day inverted a few times when using DD/MM/YYYY format.

[aib]

This has been my experience as well.

Sometimes I tell onlookers that it's an ISO standard.