如 cs58_dba 所说与 服务器本地 TZ 有关；
"TiDB evaluates system’s timezone name via TZ environment variable and the path of the soft link of /etc/localtime . If both of them are failed, TiDB then push UTC to TiKV ." from --> https://github.com/pingcap/tidb/blob/master/docs/design/2018-09-10-adding-tz-env.md#proposal-infer-the-system-timezone-of-a-tidb-cluster-via-tz-environment-variable