By default Arcadia Visualization Server uses the US Pacific timezone when creating log entries:
TIME_ZONE = 'America/Los_Angeles'
You can override this setting by adding it to the Arcadia Visualization Server Safety Valve (settings_cm.py) in Cloudera Manager, or Arcviz Settings in Ambari. The example below would be correct if I wanted my logging to be shown in US Eastern time:
TIME_ZONE = 'America/New_York'
For more information and references on the time zone names that can be passed in, please take a look at this page.