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I guess it depends on how it's being presented. If a character is speaking the time it would be whatever flows naturally. Most of the time people talk about time in relation to now, so three in the...
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Source: https://writers.stackexchange.com/a/1210 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
I guess it depends on how it's being presented. If a character is speaking the time it would be whatever flows naturally. Most of the time people talk about time in relation to now, so three in the afternoon could just be 'three o'clock'. On the other hand, when reading a clock (more so a digital clock) it might work best to be very exact with the time like "8:00 AM" because that is how digital clocks normally read. As for how to write AM/PM? It seems like all caps without the dots is the most common, but most permutations are allowed. Officially they are abbreviations but most people don't use them that way (much like PIN or ATM they are almost words in themselves).