The time difference between South Africa and Melbourne is between 8 and 9 hours. Melbourne uses Daylight savings time and thus the time varies between summer and winter. Here is a table showing the differences.
An easy way to list this clock in Windows 7 is to load Melbourne as a second time zone. Here is a tutorial on how to do that: Link. Melbourne is listed under (UTC + 10:00) Canberra, Melbourne, Sydney in the drop-down menu.
And lastly for the people who don’t want any hassle here is the current time in Melbourne.