How to Change Time Format in Windows 11 (12 or 24 Hour Clock)
https://onewebcare.com/windows/change...
Step 1: Click the Start button or press the Windows key on the keyboard.
Step 2: Open Settings by clicking the gear icon or pressing Windows + I.
Step 3: Click on Time & language from the left sidebar.
Step 4: Select Language & region.
Step 5: Under the Region section, click Regional format to expand it.
Step 6: Click Date & time format.
Step 7: Next to Short time, click the dropdown and select the preferred format. For 12-hour, choose '9:40 AM / 2:40 PM'. For 24-hour, choose '9:40 / 14:40'.
Step 8: Next to Long time, click the dropdown and select the matching format. For 12-hour, choose '9:40:07 AM / 2:40:07 PM'. For 24-hour, choose '9:40:07 / 14:40:07'.