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How to Turn On Military (24-Hour) Time on iPhone, Android, Windows and Mac

Step-by-step settings to switch iPhone, iPad, Apple Watch, Apple TV, Android, Samsung, Windows, Mac, Chromebook, Google Calendar and Outlook to military (24-hour) time, and back.

By Free Military Time Calculator Team · · Updated

Phone settings toggle labeled 24-Hour Time switched on

To turn on military time, open the device’s date and time settings and switch on the 24-hour format. The setting changes the status bar, lock screen, alarms and calendar times at once. To switch back to 12-hour AM/PM time, turn the same setting off.

iPhone, iPad and Vision Pro

  1. Open Settings.
  2. Tap General → Date & Time.
  3. Turn on 24-Hour Time.

Apple Watch

  1. Open the Watch app on the paired iPhone.
  2. Tap Clock.
  3. Turn on 24-Hour Time.

Analog watch faces with hour and minute hands do not change.

Apple TV

  1. Open Settings → General.
  2. Under Date & Time, select Time Format.
  3. Choose 24-Hour.

Android (Pixel and Most Phones)

  1. Open Settings.
  2. Tap System → Date & time.
  3. Turn off Use locale default, if it is shown.
  4. Turn on Use 24-hour format.

Samsung Galaxy

  1. Open Settings.
  2. Tap General management → Date and time.
  3. Turn on Use 24-hour format.

Windows 11

  1. Open Settings → Time & language → Language & region.
  2. Under Regional format, select Change formats.
  3. Set Short time and Long time to a format with capital HH, such as HH:mm.

Capital HH means 24-hour; lowercase h means 12-hour.

Mac

  1. Open System Settings → General → Date & Time.
  2. Turn on 24-hour time.

Chromebook

  1. Open Settings → Advanced → Date and time.
  2. Turn on Use 24-hour clock.

Google Calendar

  1. Open Google Calendar on the web and click the gear icon → Settings.
  2. Under General → Language and region, set Time format to 13:00.

Outlook

  • Outlook on the web: Settings → General → Language and time → Time format, choose a 24-hour format such as HH:mm.
  • Outlook for Windows: uses the Windows time format, so change it in Windows settings.

Why the 24-Hour Switch Is Greyed Out

The 24-hour switch is greyed out for 2 common reasons:

  • Device management: a work or school profile controls the date and time settings.
  • Screen Time restrictions: on iPhone, restrictions can lock date and time changes until they are turned off.

Can’t Change the Setting?

Read any time with the military time converter or keep the live current military time clock open in a browser tab.