Trial start times and frame rate

I am running an eyetracking experiment using PsychoPy and Eyelink1000. To track pupil diameter change across a trial, I am trying to sync the timestamp from the eyetracker with the image start and stop times, however I am having trouble with the formatting. The begin and end times are in the format of “70.85238” and I cannot gauge whether this is coming from the frames past since program started. The eyetracker timestamp is miliseconds since the tracker started recording the data, I want to make sure to convert the formats so I can sync/can see the timeframe to plot the pupil data to! Any help is appreciated!