time axis of "log file viewer" tool graph

Greeting,

I am very appreciate for the tool: "log file viewer" your platform offers, and I can view the log Dji data .CSV by excel, finally. However, I have a question about the graph "Altitude and Velocity over the course of the flight" the tool emerges. How can I get the time (Coordinated Universal Time, UTC) log data from the .CSV data, or are there other origins to get this log time data of the graph the tool show out?
?