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

If you are not happy with the current Time format and want to change this guide is what you need. Following are the steps you need to change the Time format in Windows 11.

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.

You can change the date format in Google Sheets and customize the appearance of calendar dates in a spreadsheet.