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There are 24 hours in a day, but usually times only go up to 12. After 11:00 is 12:00, and after 12:00 we go back to 1:00. Because this means there can only be 12 different times, we say that some times are a.m. (in the morning) and others are p.m. (afternoon or night). If you have absolutely no idea what time it is and someone says it's 8:00, you need to know whether that's a.m. or p.m. in order to know what time it actually is.

The other way to talk about times is to go from 0:00 (midnight) to 23:00 (11:00 p.m.). This way, the time always means "hours since midnight" -- if you say times this way, you don't need a.m. and p.m. For example, if you have no idea what time it is and someone says it's 13:00, then you know it's 13 hours after midnight, which can only mean 1:00 p.m. (in the afternoon).

2 p.m. is 14 hours after midnight, so you can say it's 14:00 or 1400 hours.

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15y ago

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