Unfortunately all the individual fit files have since been deleted. Though the fit files are stored under 2 different dates as Seestar now correctly indicates midnight is now the next day, it appears from the time calculation all the fit files were used to construct the final image. I take it this is how the software works, so during a plan, stacking continues after midnight is reached until the stop time is reached, even though the individual fit files are saved under 2 different dates.