Changing the clock format on an Android device involves adjusting either the time display format (12-hour vs. 24-hour) or customizing the lock screen clock appearance, depending on your device model and Android version. The process generally requires navigating through system settings, though some manufacturers like Samsung or Google Pixel offer additional customization options. For most devices, the core time format can be switched between 12-hour (AM/PM) and 24-hour (military) formats via the Date & Time settings menu, while lock screen clock styles may require accessing Display or Lock Screen settings.

Key findings from the sources:

• The 12-hour/24-hour format can be changed in Settings > System > Date & Time > Time format on most Android devices ^[5][6][9]
• Lock screen clock styles (e.g., double-line vs. single-line) are adjustable on Android 12+ via Settings > Display > Lock screen ^[8]
• Some manufacturers (e.g., Samsung Galaxy) allow toggling the 24-hour format in General Management > Date and Time ^[6]
• Manual time adjustments (including time zone changes) are available if automatic settings are disabled ^[1][9]

Changing Android Clock Format and Style

Adjusting the Time Format (12-Hour vs. 24-Hour)

The most common clock format adjustment is switching between 12-hour (AM/PM) and 24-hour (military) time. This setting is universally available across Android devices, though the exact path may vary slightly by manufacturer. The process does not require third-party apps and can be completed in under a minute.

For stock Android (Google Pixel, Motorola, etc.) and most other brands:

1. Open the Settings app on your device.
2. Navigate to System > Date & Time (or General Management > Date and Time on Samsung devices) ^[5][6].
3. Tap Time format (or Use 24-hour format on some devices).
4. Select either 12-hour or 24-hour format. The change applies immediately to the status bar, lock screen, and system clocks ^[4][9].

Key details about this process:

• Automatic updates: If Automatic date & time is enabled, the device syncs with network-provided time, but you can still manually override the format ^[1][6].
• Samsung-specific path: On Galaxy phones, the option is labeled "24-hour time format" under Settings > General Management > Date and Time ^[6].
• No restart required: The change takes effect immediately across the system, including the lock screen and notifications ^[5].
• Language settings: Some regions default to 24-hour format based on language/locale settings, but this can be manually overridden ^[1].

For devices running custom launcher interfaces (e.g., Nothing Phone’s launcher):

• The time format may also be adjustable via launcher settings (e.g., Home screen > Time format) ^[3].

Customizing the Lock Screen Clock Style

Unlike the time format, lock screen clock customization varies significantly by Android version and manufacturer. Android 12 introduced a double-line clock design, which was later made toggleable in Android 13. Some brands (e.g., Samsung, OnePlus) offer additional styling options, while others (e.g., Motorola) provide minimal customization.

Android 12+ (Pixel and Select Devices)

On Google Pixel and other devices running Android 12 or later, you can toggle between single-line and double-line lock screen clock styles:

1. Open Settings.
2. Go to Display > Lock screen.
3. Scroll to Double-line clock and toggle it on or off ^[8]. - Double-line: Shows time on one line and date on another (default in Android 12). - Single-line: Combines time and date on one line (classic style).

Notes on this feature:

• The toggle was officially introduced in Android 13 after user feedback on Android 12’s controversial double-line design ^[8].
• Some OEM skins (e.g., Samsung One UI) may not include this toggle, instead offering their own customization menus ^[7].

Samsung Galaxy Devices

Samsung’s One UI provides additional lock screen clock options:

1. Open Settings.
2. Navigate to Lock screen > Clock style.
3. Choose from predefined styles (e.g., digital, analog, or text-based clocks) ^[7].
4. Some styles allow further adjustments like color, size, or position.

Limitations:

• Font changes are not universally supported; some devices (e.g., Motorola) explicitly state that lock screen clock fonts cannot be modified ^[10].
• Third-party apps (e.g., Good Lock for Samsung) may offer deeper customization but are not covered in stock settings ^[7].

Other Manufacturers

• Nothing Phone (1/2): Time format can be adjusted via launcher settings (Home screen > Time format) ^[3].
• OnePlus/Oppo: Some models allow clock widget customization via Settings > Customization > Clock style (not universally available).
• Motorola: Officially does not support lock screen clock font/style changes, though Peek Display may show alternative styles ^[10].