Why does Grafana change my data

Hi, I am using Grafana to visualize csv file.

When I tried to set my time column as time field, it changed my data and thus I cannot get correct graph.

I get really confused what the problem is. Maybe the format of my exchtime is wrong?

(original data)

(after choosing it as time field)

I am just a beginner. If there exists some doc that may help, please let me know and I am glad to spend time on it. Thanks for your help!

Maybe I have found out the reason. The type of time series in Grafana is Unix timestamp. Whatever, thanks for your time on this matter.

If you don’t specify a timezone, Grafana will expect your timestamps to be in UTC. If they’re not in UTC, you should explicitly include the timezone in the timestamp field (in your source data).