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How to view the Windows 10 major update date? 

How To
How To cmd

Every 6 months, Microsoft releases a "major" update for Windows 10.

But the OS doesn't install them right away. So if you don't know when the last major update was, you can check in one of the following ways.

The first method:
Open "Settings - > System -> About". The "Installation Date" field will indicate the date of the last major update.

The second method:
run the command prompt and run the command:
systeminfo | find " installation date"

The operation returns the date of the last major update and displays it on the screen.