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On the off chance that this isn't a novel, just be consistent. Some writing (academic, non-fiction, and news, for example) is edited to a style guide, and most style guides will have a preferred wa...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/1225 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
On the off chance that this _isn't_ a novel, just be consistent. Some writing (academic, non-fiction, and news, for example) is edited to a style guide, and most style guides will have a preferred way to format times and dates. For fiction, and particularly in dialog, you specifically _don't_ want to come up with a consistent system unless you want everything to seem the same and uninteresting. Characters who are inconsistent in little things like this seem more human and accessible. (For example; As it's now ten o'clock in the evening where I am, I need to get off the web within the hour because I need to get up at five in the a.m.)