Hi Haiqiang ,
Are you referring to "current time" showed at https://gpcc.docs.pivotal.io/410/graphics/ui-query-monitor-full.png ?
It should be similar to the server time which you can get from "select now()" through psql .
Please provide a snapshot of the timezone you are referring along with Greenplum database & Command center version information for us to check further.
@Alex Jiang fyi ^