How to Change Apple Watch to Military Time (24-Hour Format)

Switching your Apple Watch to military time — officially called 24-hour time — is a straightforward setting change, but the path to get there, and what actually changes on your watch face, depends on a few variables worth understanding before you start tapping.

What "Military Time" Actually Means on Apple Watch

Military time is simply the 24-hour clock format, where hours run from 00:00 to 23:59 instead of cycling twice through 1–12 with AM/PM labels. 13:00 is 1 PM. 00:00 is midnight. There's no ambiguity about whether 6:00 means morning or evening.

On Apple Watch, the 24-hour setting is tied to your iPhone's regional time format — not a standalone toggle inside the Watch app. This is an important distinction because many users go hunting in the wrong place first.

The Two Ways to Enable 24-Hour Time

Method 1: Change It Through iPhone Settings (Primary Method)

This is the standard approach and affects both your iPhone and Apple Watch simultaneously.

1. Open Settings on your iPhone
2. Tap General
3. Tap Date & Time
4. Toggle 24-Hour Time to the on position

Once enabled, your Apple Watch will reflect the change automatically — no restart required, no pairing needed. The update typically propagates within a few seconds.

Method 2: Change the Watch Face Display Directly (Limited Use Case)

Some complications and watch faces display time independently of the system clock format. If you're using a third-party watch face app or a custom complication that shows time, that specific element may have its own format setting inside its companion app.

This method only applies when:

• You're using a third-party app that renders its own clock display
• The native time display is already correct but a complication is showing the wrong format

For most users, Method 1 handles everything.

What Changes — and What Doesn't ⏱️

Understanding the scope of this change helps set expectations.

One nuance worth knowing: Siri on Apple Watch tends to verbalize time in 12-hour format ("It's three forty-five PM") even when your display is set to 24-hour. This is a voice output behavior, not a bug in the time setting itself.

Why the Setting Lives on iPhone, Not the Watch

Apple designed watchOS to inherit regional and locale settings from the paired iPhone rather than maintaining independent system preferences. This applies to time format, date format, temperature units, and language settings.

The practical effect: you can't set your Apple Watch to 24-hour time while keeping your iPhone in 12-hour format through standard settings. They move together. If that unified behavior doesn't fit your workflow, some third-party watch face apps in the App Store do allow independent time format settings within their own display — but that's a workaround, not a native capability.

Variables That Affect Your Experience

Not everyone's result looks identical after making this change. A few factors that create different outcomes:

Watch face type matters. Analog watch faces with traditional clock hands don't display digital time numerals at all — so a 24-hour setting has no visible effect on the face itself. The change will still affect any digital complications on that face (like a time-in-city complication), but the main hands won't suddenly show "14" instead of "2."

watchOS version. The path described above applies to current watchOS and iOS versions. On older software versions (pre-watchOS 7 era), the menu structure was slightly different, though the underlying setting has always lived on the iPhone side.

Regional format settings. If your iPhone is set to a region where 24-hour time is the default (much of Europe, for example), the toggle may already be enabled without you having changed it. Conversely, switching your iPhone's Region setting can inadvertently flip your time format as a side effect.

Multiple Apple Watches paired to one iPhone. If you've paired more than one watch, both inherit the same iPhone system time format. There's no per-watch override for this setting natively.

Common Troubleshooting Scenarios

Watch didn't update after toggling the setting: Give it 10–15 seconds. If the watch face still shows 12-hour format, raise your wrist to wake the screen — it sometimes needs a display refresh.

The toggle isn't visible in Date & Time settings: Some iOS versions present this toggle only when the device region supports 24-hour time as an option. Checking your Region setting under General > Language & Region may reveal why.

Time shows correctly on watch but not in a specific app: That app likely manages its own display format. Check the app's settings or its iPhone companion app for a time format preference.

Whether 24-hour time actually improves your daily experience depends on how you read time mentally, which watch faces you use, and whether the unified iPhone-and-Watch behavior fits how you use both devices together. 🕐