Found the answer in another topic.

Originally Posted by AndrewAMD
Your csv is oldest to newest, but Zorro uses data from newest to oldest. Change your format string to indicate the reverse order.

Originally Posted by AndrewAMD
That works too. I was referring to adding a + sign to the front of the string, to indicate ascending order.



Added + sign resolved the issue
Code
string Format = "+,%Y-%m-%d %H:%M:%S,f3,f1,f2,f4,f6";



Still asking for a recommendation how to automate convertation of 500 .csv data files to .t6. Total newbie in Lite-C.

Thanks