trim an ac3 with eac3to

[maudit]

hi, I have an ac3, 1:49:16.228 long.
I would like to trim it and save a sample that start at 0:03:40 and ends at 0:05:40.

I first give the ac3 the following command:
%_.ac3 -220000ms
the new edited ac3 starts correctly at 0:03:40.
but now, what command to tell eac3to to cut this edited file from 0:02:00 to the end?

edit: ok I did it by using
%_.ac3 -edit=0:02:00.000,-6336228ms
where 6336228ms is the difference between 1:49:16.228 and 0:03:40

is it possible to save a part in the middle of an ac3 with more elegant commands,
without converting to ms and subtracting or anyway in a single command and job?