Change a time on wordpress site to time zone a static time

I have a wordpress website and it displays this on our contact page

"Our hours are 06:00-15:00 UTC/GMT"

I would like to display this time to the correct timezone when the user is viewing the webpage. for example from south africa

"Our hours are 08:00-17:00 UTC/GMT"

If possible can this be done with a plugin because I dont know php to go changing script or sql queries

Thank you any help welcome

via Chebli Mohamed