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[–] 2 points 4 months ago (1 child)

12:30 pm is half-past noon.

12:30 am is half past midnight, or as you would say 00:30

The m is "meridian" which is noon (sun straight up)

The a is ante/before and the p is post/after

In olden days it was easier to look up and set your clock at noon than midnight.

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