code:
$datetime=join(split(@DATE,'\'),'.')+'-'+join(split(@TIME,':'),'.')
Copy 'C:\new\FIXServer.log' 'C:\new\FIXServer'+$datetime+'.log'

However,take a look at the UDF Forum with regards to filename UDFs and write a more generic routine that does not hardcode the filename.

You might also want to search the KiXtart BBS as these things have been discussed before.
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There are two types of vessels, submarines and targets.