Last Tested: May 22, 2019
At a high level: i__looker/System Activity timestamps are in System Timezone - the timezone for the server that Looker is running on. This is not tied to any DB timezone setting or any timezone settings in the Looker platform.
The i__looker/System Activity timestamps are UTC on all hosted Lookers
It’s possible that if you host your own instance, you may be in another system timezone.
Chat Tip: The i__looker/System Activity timestamps will not change and are not dependent on Application Timezone, Database Timezone, or any other Instance Timezone setting. Solely the System Timezone.
Chat Tip #2: Changing the System Timezone is not a trivial change and is not recommended. If an end user needs to change/shift individual timestamps, then they are better off using table calcs to adjust the time. for example:
add_hours(-5, ${time})
This content is subject to limited support.