Time zone issue

[mathsigit]

When the time zone of physical machine that installed varOne-server was different with varOned,
varOne web ui always didn't receive the correct time zone datas of metric.

For example, the time zone of varOned server was GMT +0, and the time zone of varOne-server was GMT +8.
When varOne-server request the start time and end time interval , it would call System.currentTimeMillis() to get time of varOne-server, and varOne-server would never get the correct data of time zone.

Should we check the time zone of varOne-server and varOned, or selected the time zone by user in the front side?