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You should be able to use date. Type info date or man date for details.
date
info date
man date
Something like the following might suit you (change the date format to your needs)
yourcommand > filepathandnameprefix$(date +"%D+"\%d-%m\%m-%Y"\%Y").extension
yourcommand > filepathandnameprefix$(date +"%D-%m-%Y").extension
yourcommand > filepathandnameprefix$(date +"\%d-\%m-\%Y").extension