Make timestamp of fuzz harness archives finer grained.

R=machenbach@chromium.org

Review URL: https://codereview.chromium.org/329303004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21821 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

tools/fuzz-harness.sh

@@ -85,7 +85,7 @@ python -u "$jsfunfuzz_dir/jsfunfuzz/multi_timed_run.py" 300 \
     "$d8" $flags "$jsfunfuzz_dir/jsfunfuzz/jsfunfuzz.js"
 exit_code=$(cat w* | grep " looking good" -c)
 exit_code=$((100-exit_code))
-tar -cjf fuzz-results-$(date +%y%m%d).tar.bz2 err-* w*
+tar -cjf fuzz-results-$(date +%Y%m%d%H%M%S).tar.bz2 err-* w*
 rm -f err-* w*
 
 echo "Total failures: $exit_code"