add timestamp to fieldlist in wireshark

["haneugen () yahoo de" <haneugen () yahoo de>]

Hi,
I am using tshark to extract all the fields I need out of a capture and to further process them. But as you know 
processing becomes much easier when working with numerical values instead of having to parse strings thus I would like 
to add a field containing the unix timestamp (relative_time is unfortunately not sufficient) to the tshark field list. 
Does anybody has an idea how to do that, e.g. which field to add?
Thanks in advance.
Cheers

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