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12-Hour to 24-Hour Converter

Turn AM/PM times into 24-hour military time — one time or a whole schedule.

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24-hour time

Quick Tool Overview

The 12-Hour to 24-Hour Converter turns AM and PM times into the 24-hour clock — single times, lists or times inside ordinary text — handling 12 AM, 12 PM, noon, midnight and seconds correctly.

What it does
Converts AM/PM times to 24-hour time
You give it
Times, lists or text containing times
You get back
24-hour or military times in place
Best for
Rotas, timetables, logs and spreadsheets
Converters Free, unlimited use No sign-up Runs in your browser

About the 12-Hour to 24-Hour Converter

Twenty-four-hour time is what timetables, rosters, logs, spreadsheets, databases and most of the world use, because it never needs AM or PM and sorts correctly. Converting from the 12-hour clock is easy except for the two cases everyone hesitates over: 12 AM is midnight, 00:00, and 12 PM is noon, 12:00.

Paste a single time, a column of them, or a whole paragraph. Each line that is a time is converted, and times written inside sentences — "from 10:30 AM to 2 PM" — are converted in place without touching the words around them. It reads AM, am, a.m. and noon or midnight, keeps seconds when they are given, and can write military time without a colon. A full 24-row reference chart sits underneath.

Key features of the 12-Hour to 24-Hour Converter

Midnight and noon right

12 AM becomes 00:00 and 12 PM stays 12:00 — the two conversions that cause most mistakes.

Works inside sentences

Times written in running text are converted without changing the words around them.

Reads every style

AM, am, a.m., noon and midnight, with or without minutes and seconds.

Military format

Write 24-hour times with a colon, a dot, or no separator at all.

Reference chart

A full 24-row chart of 12-hour and 24-hour equivalents is shown below.

How to use the 12-Hour to 24-Hour Converter

  1. 1

    Paste the times

    One per line, or a sentence or schedule containing them.

  2. 2

    Choose seconds and separator

    Keep seconds only when given, always or never; colon, dot or no separator.

  3. 3

    Read the 24-hour times

    Each time is converted in place, with lines that contain no time listed.

  4. 4

    Copy or download

    Take the converted list or text, or check the reference chart below.

Frequently asked questions

00:00. 12 AM is midnight at the start of the day; 12:30 AM is 00:30.

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