Under Account > Settings > Time zone an admin can set the global time zone for their entire SimpleMDM instance. This is the timestamp used in logs, enrollment date, etc.

I'd like the ability for each admin user to set their own time zone as well. Having a per account setting is a small quality of life change which makes it easier to grok events. I prefer to read timestamps in my local time. Time data itself should not change, only what's presented to the user.