As noted on the page, the tracklog times are always in your time zone preference (both fields from Time Zone in your Profile) to prevent confusion about time zone crossing. If you want to see UTC set them to “GMT/UTC/Zulu” and “Display Flights In My Time Zone”.
Daylight savings time is handled appropriately for the time of year when the flight began.
This may be a good time to bring up a point for both newbies and oldbies: It’s always beneficial to do several things on this site and other sites:
Read the FAQs (or Questions/Answers in the case of FlightAware)
Click all links to see what they do
Read (or at least browse) any forums on the site
It should be obvious why it’s good for the newbies but the oldbies, too? Yes - because sometimes we forget or just haven’t discovered yet features that may be useful to us.