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To change the time format follow these steps:
Open the Windows 10 Settings app(Right click on start menu or press Windows key + i)
Select Time and Language settings.
Go to Date & Time section.
Click on Date, time & regional formatting on the right.
Click on Additional date, time, & regional settings.
The Control Panel will open.
Click on Change date, time, or number formats.
Click on Short time.
Choose h:mm tt or hh:mm tt for the default 12-hour clock.