Where is the 24-hour time setting?
Switching between 12- and 24-hour time is one of the most consistently deep settings in the catalogue: on the great majority of systems it is exactly three taps from the start. We read the settings tree of all 43 systems in the catalogue and recorded where each one keeps it.
What each system calls it
25 of the 43 operating systems in our catalogue have this setting, and between them they use three different labels for it:
| Name on screen | Systems |
|---|---|
| Use 24-hour format | 15 |
| 24-Hour Time | 5 |
| Time Format | 2 |
| Time format | 2 |
| 24-hour time | 1 |
The most common is Use 24-hour format, on 15 of the 25. If that is not the word on your screen, the table above is the rest of the vocabulary to try.
Some of those rows differ only in capitalisation — 5 spellings for three actual names. We have kept them apart because that is what is printed on the screen, and a settings search that matches case will tell them apart too.
Where it lives on each system
These are the shortest paths from the first settings screen on the newest release of each system. 2 of the 25 are within two taps; the rest sit deeper, and the table shows how much deeper.
| System | Path | Taps |
|---|---|---|
| Firefox OS Firefox OS 2.5 | Date & Time › Time Format | 2 |
| watchOS 27 | Clock › 24-Hour Time | 2 |
| Garmin System 20 | System › Time › Use 24-hour format | 3 |
| Google TV 14 | Device Preferences › Date & time › Use 24-hour format | 3 |
| HarmonyOS 6.0 | System & updates › Date & time › Use 24-hour format | 3 |
| Huawei Watch HarmonyOS 5 | Settings › Time › Use 24-hour format | 3 |
| HyperOS 4.0 | Additional settings › Date and time › Use 24-hour format | 3 |
| iOS 27.0 | General › Date & Time › 24-Hour Time | 3 |
| iPadOS 27.0 | General › Date & Time › 24-Hour Time | 3 |
| KaiOS 3.0 | Device › Date & Time › Use 24-hour format | 3 |
| macOS 27 Golden Gate | General › Date & Time › 24-hour time | 3 |
| Meta Quest v81 | System › Date and Time › Use 24-hour format | 3 |
| Nintendo Switch 22.5.0 | System › Date and Time › Use 24-hour format | 3 |
| One UI 9 | General management › Date and time › Use 24-hour format | 3 |
| OxygenOS 16 | System settings › Date and time › Use 24-hour format | 3 |
| Roku OS Roku OS 16 | System › Time › Use 24-hour format | 3 |
| Symbian Belle | Phone › Date and time › Use 24-hour format | 3 |
| tvOS 27 | System › Date and Time › 24-Hour Time | 3 |
| Ubuntu 26.04 LTS | System › Date & Time › Time Format | 3 |
| visionOS 27 | General › Date & Time › 24-Hour Time | 3 |
| Windows XP SP3 | Date, Time, Language, and Regional Options › Date and Time › Use 24-hour format | 3 |
| Zepp OS Zepp OS 6 | System › Units › Time format | 3 |
| LG webOS webOS 26 | General › System › Time › Use 24-hour format | 4 |
| Samsung Tizen TV Tizen 10 | General and Privacy › System Manager › Time › Use 24-hour format | 4 |
| webOS OSE OSE 1.1 | General › Time & Date › Time › Time format | 4 |
Each system name above opens the real menu in the simulator, so you can walk the path before you touch your own device.
Why the names came out this way
Three taps is unusual. Most things either surface at one or two, or hide at four and beyond. The 24-hour switch sits at three because it is almost always a row inside the date and time screen, which is itself inside a system or general group — a consistent three-level nesting that almost every vendor arrived at independently.
The phrasing is revealing too. Use 24-hour format is a sentence, not a label: it is the system asking a question rather than naming a feature, which is what settings do when the answer depends on where you grew up.
Find it on your own device
If your system is not in the table, or the label on your screen is different again, there are three ways through it:
- Search every system at once for a setting by name — it looks inside all 43 trees, not just the one you are holding.
- Open your own system in the settings simulator and click to the screen without changing anything real.
- Follow the step-by-step guide to changing the system language, or see where that setting lives on every system.
Related settings in the same part of the menu:
- Where are the date and time settings?
- Where are the keyboard settings?
- Where is the autocorrect setting?
All of it comes from the same catalogue: 43 systems, 135 versions, published as an open dataset.
Try it yourself, on the real menusOpen any of 43 operating systems in your browser and walk the Settings tree exactly as it appears on the device. No download, no account.Frequently asked questions
Where is the 24-hour time setting on most systems?
On 2 of the 25 systems that have it, within two taps of the first settings screen. The most common label is “Use 24-hour format”, used by 15 of them. The table above gives the exact path for each system.
Why can I not find it by searching my settings?
Because settings search matches the label your system uses, and there are three different labels in use for this one setting. Searching for the word your previous device used is the single most common reason a setting appears to be missing.
How many systems have this setting at all?
25 of the 43 operating systems we catalogue. The rest either have no hardware for it or fold the behaviour into something else, which is why a feature that feels universal often is not.