I have not changed my default flight/time, so I'll start off with the Friday Harbor flight, change to my desired field, usually Sanford-Orlando (KSFB), which then puts it three hours later, because of time zones, than Friday Harbor. So, the 6:45PM (my computer's local time) becomes 9:45PM in KSFB, when I want it to be 6:54PM in KSFB.
Note, however, that on the time/date selection screen there is the
Reset button. Clicking on that resets the flightsim time to your computer's local time.

At least, that's the little "dance" I go through. *MY* personal preference is to always start from a default flight, and then change to a location/aircraft, etc.