Sorry, I couldn't find pricing data for that day. The closing price for Bitcoin (BTC) in terms of ZAR on September 18, 2020 was 178,833.10. It was up 0.9% for the day. The latest price is 1.9M.
DATE
OPEN
HIGH
LOW
CLOSE
September 18 2020
177,213.92
—
—
178,833.10
Daily pricing data for Bitcoin dates back to 7/14/2010, and may be incomplete.