having the datetime column in milliseconds

Kian

Hi everyone,
I need to have the "datetime" column in the log file in milliseconds.
I'm using this at the beginning of the experiment:

but this is about two seconds later than the "datetime" and the reason is that the "datetime" starts when the backend starts!
since all of the time columns are relative to this column("datetime"), it is important for me to have the beginning time with more precision.
(I'm trying to use the "datetime" column to sync the Opensesame and EEG. we are running both EEG and Opensesame on one PC)

Thanks in advance,
Kian