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Monthly Rule
(lemmy.dbzer0.com)
Be sure to follow the rule before you head out.
Rule: You must post before you leave.
As an American (California native, living in the Midwest for the last decade), it's not that weird. I hear people using "December 12th" and "12th of December" with about equal frequency. Written, though, "December 12th" is more common, and if you're just using the numbers, everyone will assume the month is first.