fix timestamp shifting. fix #633
fix timestamp shifting. fix #633

replay/metrictank,raintank/metrictank,raintank/raintank-metric,raintank/metrictank,raintank/metrictank,replay/metrictank,raintank/raintank-metric,raintank/metrictank,raintank/raintank-metric,replay/metrictank,replay/metrictank