How to set TimeZone using Powershell

This is how I do it in setup scripts...although our AD infrastructure would set this when the machine joins the domain anyway...I like to be thorough in my scripting :)

%windir%\system32\tzutil /s "Eastern Standard Time"

At least in newer versions of Powershell (5.1 and later), there is a cmdlet. See the docs.

Set-TimeZone "Eastern Standard Time"

Older versions can find the script here.