By the way, I also tried converting column A from DATE into Unix format and use %t.

dataParse did not work with %t and neither did dataSaveCSV (I get an invalid parameter error).

So far the only way I got it working is by manually converting column A to DD/MM/YYYY and use
string Format = "+%d/%m/%Y,f3,f1,f2,f4,f6,f5";