PowerShell - Set-Culture doesn't seem to change anything

The root cause is because you are not running the PowerShell with Administrator privilege.

Set-Culture needs Administrator privilege to be set on the system.

Just run your PowerShell in Administrator mode and your culture will be set to the new one as below:

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Hope this helps!

Like petseral said in a comment above:

Changing user locale does not affect already started PowerShell instances.
You have to start new PowerShell process.

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