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3:45 PM = 15:45

Time Format Converter

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Convert 12-hour (AM/PM) time to 24-hour (military) time and back — with a full conversion chart and the midnight/noon rules.

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Convert a time between the 12-hour clock (AM/PM) and the 24-hour clock (military time). The rule is simple: for AM keep the hour (12 AM → 00), for PM add 12 (12 PM stays 12) — minutes never change.

Quick conversion chart

12-hour24-hour12-hour24-hour
12:00 AM00:0012:00 PM12:00
1:00 AM01:001:00 PM13:00
2:00 AM02:002:00 PM14:00
3:00 AM03:003:00 PM15:00
4:00 AM04:004:00 PM16:00
5:00 AM05:005:00 PM17:00
6:00 AM06:006:00 PM18:00
7:00 AM07:007:00 PM19:00
8:00 AM08:008:00 PM20:00
9:00 AM09:009:00 PM21:00
10:00 AM10:0010:00 PM22:00
11:00 AM11:0011:00 PM23:00

12 AM = 00:00 (midnight) · 12 PM = 12:00 (noon). For the full breakdown, worked examples, and the reverse (24 → 12-hour) rules, see the 12-hour to 24-hour time guide.

The interactive one-click converter is being built. In the meantime the chart above covers every hour — or use the Timezone Converter if you also need to change timezones.

Frequently Asked Questions

How do I convert 12-hour time to 24-hour time?
For AM times keep the hour (but 12 AM becomes 00); for PM times add 12 to the hour (but 12 PM stays 12). Minutes don't change. So 3:45 PM → 15:45 and 7:20 AM → 07:20.
What is 12 AM and 12 PM in 24-hour time?
12 AM is midnight = 00:00 (the start of the day). 12 PM is noon = 12:00. This is the most common mistake — 12 AM is 00:00, not 12:00.
Is 24-hour time the same as military time?
Yes. Military time is the 24-hour clock, usually written without a colon and spoken in hundreds — 14:00 is 'fourteen hundred'. The conversion rules are the same.

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