Mismatch in time_stamp

I have interfaced Bolt device with arduino,in the csv sheet I see that time_stamp is entirely different from original i.e it is in UTC,so I am unable see the graph

here is the screenshot,please help me with this.

I think you have kept the bolt WiFi module at same place…try keeping it in dark room and in sunlight you’ll see the changes in the values and you’ll get a good graph.

But it should be plotted right ,but is not