There are many date formats. I personally use all of 'd/m/y', 'd-m-y', 'd-spelled_month-y', 'd spelled_month y', 'm/d/y', 'm-d-y', and 'spelled_month d, y', and 'y-m-d'. In addition, y is 2 or 4 digits, and the spelled month might be fully spelled or abbreviated in some way.
In the end, one must either pick a format that is predictable and understandable, or suffer from mysterious conversion errors. If someone types in 10-10-10, what date is it? Using y-m-d solves the problem, and is trivially explainable.
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