Thanks for your help. I wanted to clarify that what I am doing is importing a .csv file into a database table, and then updating a column (called "current date and time stamp") via update statement using VBA code.
S7 = "Update [Assay Mix Replicates_Temp] Set [Date/Time Stamp] = '" & Format(Now(), HHnnss) & "'"
DoCmd.RunSQL S7