Importing data from a CSV file, how do I edit props.conf to assign a specific column to be parsed as _time?

Hi Guys, I do data import from a CSV and I would like set the eventtime ( _time) to a specific column because the automatic timestamp assignment did not work for me. Is my config possible? What is wrong? ActualStartTime is a Column in the header of the CSVFile. props.conf: [source::D:\Data\*.csv] TIME_PREFIX = ActualStartTime TIME_FORMAT=%y/%m/%d-%H:%M:%S.%3N thanks I am 404