Error when trying to change the time zone in Windows: "Unable to continue. You do not have permission to perform this task."

Looks like "for whatever reason" my installation didn't grant anyone, nor any group the privilege to change the time zone -- I had to:

1. Go to the desktop
2. Open the charms bar (Win+c, float mouse to bottom right or swipe from the right)
3. Choose Control Panel
4. Switch to icon view
5. Go to Administrative Tools folder
6. Run Local Security Policy
7. Double click on "Change time zone" permission
8. Add local administrators group.
9. Reboot...
10. Change timezone "in the normal fashion"

The following did not work for me: * Add Users group to Administrative Tools > Local Security Policy > Security Settings > Local Policies > User Rights Assignment > Change the time zone.

After the reboot, i still could not change the timezone. I solved it by using Powershell instead. This is how i solved it on a Windows 2012 R2 server:

1. Downloaded Powershell version 5.1 and installed it on the server.
2. Rebooted server.
3. Open Powershell with "Run as an administrator"
4. Run command:

Set-TimeZone "W. Europe Standard Time"

It makes no sense to me but the following config fixed the problem on my Win10 laptop which was upgraded from Win7 or Win8 (forget which). My login account was already in local Administrators group which was already granted the same config:

• Add Users group to Administrative Tools > Local Security Policy > Security Settings > Local Policies > User Rights Assignment > Change the time zone.

Refer to Date and Time – Unable to Continue on Problem Solved answer site for detailed step by step instructions.