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Or getting Americans on the metric system.

You start by making gun calibres metric. Then they either start using the metric system or stop using guns. Win either way.

No then we just end up with two standards, like a 9mm caliber which is the same as the .380 ACP and others (diameter wise)

Or getting them to use a sensible way to state dates.

Agreed. Ditto for most of Europe. Everyone should standardize on YMD. Lexical sorting and least-to-most specific times make the most sense.

Or just [year].[day#]

Like 2016.276