To convert 24-hour time to standard 12-hour time, you look at the hour number and either keep it the same, adjust for midnight, or subtract 12 for afternoon hours. While the 24-hour clock counts continuously from 00:00 to 23:59, standard time splits the day into two 12-hour cycles labeled AM and PM. The Core Conversion Rules
The transformation depends entirely on what hour block the 24-hour time falls into:
00:00 to 00:59 (Midnight Hour): Change the 00 to 12 and add AM. (Example: 00:30 becomes 12:30 AM).
01:00 to 11:59 (Morning): Keep the hours the same, remove any leading zeros, and add AM. (Example: 08:15 becomes 8:15 AM).
12:00 to 12:59 (Midday): Keep the hours the same and add PM. (Example: 12:45 becomes 12:45 PM).
13:00 to 23:59 (Afternoon/Evening): Subtract 12 from the hour and add PM. (Example: 17:00 becomes 5:00 PM). Hourly Quick-Reference Table
This quick reference table maps the conversions directly, keeping the minutes exactly identical across both formats:
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