You can reset offsets for consumer group by using kafka-consumer-groups tool – https://docs.cloudera.com/runtime/7.2.1/kafka-managing/topics/kafka-manage-cli-cgroups.html (this is from cloudera, but included in any kafka distribution from v0.11)
You could also run the following:
./kafka-run-class.sh kafka.tools.GetOffsetShell --broker-list <hostname>:<port> --time <epoch> --topic <topic> and get offset by time.
Refer to https://cwiki.apache.org/confluence/display/KAFKA/System+Tools#SystemTools-GetOffsetShell
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