append a filename with system date and time

Hi,
There are similar kind of posts, but none seems like working for me. Please correct me if I'm wrong.

I need append/rename file abc.txt with file processed date and time like abc_systemdatetimestamp.txt
and move it to different folder.

for example I have

/source/data/abc.txt

after processing this file I need to move this file to and as

/source/archive/abc_20110730112230.txt

what I tried is...as I know is not the right approach may be

mv /source/data/abc.txt /source/archive/abc.txt|date +G%d%H%M%S

and

mv /source/data/abc.txt /source/archive/abc|date +G%d%H%M%S.txt

Thanks in advance.

mv /source/data/abc.txt /source/archive/abc_`date +G%d%H%M%S`.txt