Date format is a way to represent a given date, usually textually.

Some formats

• ISO one, the best one

• The European one with dots

• The American one with slashes

• The Japanese one with dots

• The Japanese one with hieros

A date idea 2022-10-05

join(sort-ascending(DD, MM, YY), "•")

So today is 05•10•22, which is not really exciting, but think about days like 23rd of May: 05•22•23.