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This comment was posted at Thread: 12 hour or 24 hour?.
Avatar of TASIP
I strongly prefer 24-hour clock system. Just for the sake of saying: "Thirteen o' clock."
Avatar of spopo
"Thirteen hundred hours"

I think "o' clock" is only used by 12 hour time, not sure. It does make sense since a clock does not have more than 12 divisions, and the origin of the phrase obviously involves a clock :o
Avatar of SignerJ
From what I understand, "o' clock" can be used with either time system, but "Hundred hours" is for military time, which uses the 24-hour system, but not all 24-hour systems are military time. (Run-on sentence?) Kind of like the square-rectangle relationship, or something.
Avatar of TASIP
"O' clock" means of the clock. And what do we call those digital things with timers? Digital clock.

Yeah, it might be used only on those 12-hour clock things, but that's the literal meaning.