Forex Market is open 24 hours during 5 days in a week, so in theory it is open all the time during the weekdays.
That is in theory though, because the prices don't necessarily move during all the sessions or market hours. That is because most traders (I mean the largest intraday volumes), they are active during the working hours in their regions.
EU & UK traders (banks, institutions etc.) are active during their working hours, North American during theirs.
So, I think what you are trying to ask is when should you be trading forex from South Africa?
The time in South Africa is London +2.
This means, when the Frankfurt opens, it is 9AM in South Africa. So, if you want to trade EUR/USD or GBP, then this is the time you could trade it i.e. the London session, if you are trading these currencies. DAX & FTSE100 also move during these hours 9AM-12PM South African time.
But if you are trading any specific instrument which has volatility during the other sessions, then you should trade that during NY session from 2PM-7PM South African time. That is when indices like NASDAQ or US stocks are most active. Also, USD (including EUR/USD) & CAD pairs are traded in this session.
My suggestion is to actually carefully watch for patterns in price movements of whatever instrument you are trading. Overtime you will start to see during what hours does it move. Is it mostly trending during those hours, or is it sideways. Can you build a system around it, for entry & exit. What is the hit rate, and average risk per trade.
