YYYY-MM-DD is the best date format and here's why:

  1. Putting the year first instantly frees you from US/EU date ambiguity, as it makes it obvious that the date comes straight after the year.
  2. Sorting dates alphabetically also sorts them chronologically.
  3. Dots and slashes are problematic in file names; hyphens are standard.
  4. It makes dates increment from the right-hand side, just like numbers do.
  5. It follows the ISO 8601 international standard.
  6. It looks badass.

All other date formats are inferior. There will be no further discussion on the matter.

– Rich