($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst)=localtime(time);
printf "%s-%4d-%02d-%02d-%02d:%02d:%02d\n",$0,$year+1900,$mon+1,$mday,$hour,$min,$sec;

e.g.  test.pl-2007-11-10-07:09:52
      test.pl-2007-11-10-07:11:53
      test.pl-2006-11-10-05:05:53