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    This answer is spot on. By the way, as I mentioned in a comment to another answer, the pronunciation "oh dark thirty" probably stems from service branch. In the Marine Corps, there was a lot of emphasis on pronouncing 0500 as "zero five hundred" instead of "oh five hundred," etc., and, as a result, we said "zero dark thirty" instead of "oh dark thirty." Commented Dec 31, 2012 at 6:57
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    Also, "dark o'clock" in non-military contexts. Commented Aug 28, 2014 at 19:21