Here is a tutorial showing you how to change Date and Time formats (US, International, etc) on Windows 11 using Settings or Control Panel.

Learn how to change Time format in Lock Screen in Windows 11/10. Change the clock to a 12-hour or 24-hour format using Settings or Control Panel.

In this screen you can change how Windows displays the time by specifying different format strings, or notations, in the Short Time and Long Time fields.

On Windows 11, you can manage the date and time settings to match your preferences. You can even show details in full format, and in this guide, I will explain how to complete this configuration.