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Import does not support the time portion of DateStringFormat. (This is a deficiency in the docs if not a bug ) If you know the specific column(s) where your date appears you can map datelist like this: MapAt[DateList[{#, {"Year", "Month", "Day", " ", "Hour", ":", "Minute", ":", "Second", ".", "Millisecond"}}] & , Import[filename.csv], {All, ...


I found solution at this answer: How can I import a huge CSV file quickly? And also improved loading speed of my 250Mb CSV file

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