Does Daylight Saving Time affect local airspace? Only some countries use Daylight Saving Time. In Canada, some provinces use and don't use DST (such as Saskatchewan). However, in remote and local regions where this is not observed, what would happen?

What happens when areas that do not observe DST are controlled by areas that do. (Cleveland controls parts of Southern Ontario). How does this affect local airspace? Does it affect global airspace as well? What are the safety implications? How does it affect Air Traffic Controllers operating these different spaces?
Aviation always uses UTC time. This is from the FAA's AIM, but other countries do the same for obvious reasons:


  4-2-12. Time
  
  a. FAA uses Coordinated Universal Time (UTC) for all operations. The
  word "local" or the time zone equivalent must be used to denote local
  when local time is given during radio and telephone communications.
  The term "Zulu" may be used to denote UTC.


This question covers in much more detail why UTC is used in preference to GMT, and this question explains why pilots need to know the time in the first place, at least under IFR (which applies to almost all airline flights).