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Reminds me of a date column where half the dates were MM/DD/YYYY and the rest DD/MM/YYYY. I did manage to eventually find the point in time when it changed and normalise the database. For those wondering about DD/MM, Australia.

[tsujamin]

And most countries :)

https://en.wikipedia.org/wiki/List_of_date_formats_by_countr...

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Sure, just trying to explain it to US ;)