Created_Time question

Created_Time question

I'm a bit confused'bout something while using the Rest api.  When querying Deals (Module), part of the json properties returned is something thus
   "Created_Time": "2019-03-01T08:19:10-08:00",

What I'm not clear about is ..is this date above GMT but the data was created from a timezone that's 8hrs behind GMT or is this date/time 8hrs behind GMT?

thanx