Date format is a way to represent a given date, usually textually.
Some formats
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ISO one, the best one
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The European one with dots
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The American one with slashes
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The Japanese one with dots
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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.