Windows 8.1 - How to change the date and time formats
To change the date and time formats of Windows 8.1, follow the below procedure:
From the Start screen, launch the Charms bar (Windows Key + C).
Go to Settings > PC settings > Time and language.
In the Date and time section, click on Change date and time formats.
From there you can configure the following options:
First day of the week
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