change the "format" (hint search for "format" in the Log::Log4perl docs)

FWIW the defaults have timestamps

$ perl -e "use Log::Log4perl qw/:easy/; Log::Log4perl->easy_init($INFO
+); DEBUG 1; ERROR 2; INFO 3; "
2014/12/10 02:41:57 2
2014/12/10 02:41:57 3
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