how to add addional clock( UK , UAE, Srilanka, Singapore time zone) to machine ussing group policy

Hi Team,

Happy Christmas!!

Please help me to add additional clock using group policy in client machine.

i have 100++ windows 7 machine where i want to add 4 more time zone .

I have followed the below link but bad luck.

http://dennisspan.com/configuring-regional-settings-and-windows-locales-with-group-policy/