Quick Tip: How to Represent a.m. and p.m.

Although it is somewhat uncommon for specific times to come up in scientific writing, there are occasions where it is necessary (e.g., feeding cycles, treatment protocols, etc.). In these cases, it is important to represent times correctly. So, here are a few rules to keep in mind:

1) When using ‘a.m.’ or ‘p.m.’, represent them as I just have: lowercase letters with periods after each letter (a.m. is short for ‘ante meridiem’ or ‘before midday’ and p.m. is short for ‘post meridiem’ or ‘after midday’).

2) Use ‘midnight’ and ‘noon’ when speaking of 12 at night or 12 in the afternoon.

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