I have been thinking about this for a long time now, and no one can answer it. I forget the exact length span, however, the span for each is not equal. For example, DST is 120 days, and "standard" time is 245 days. It would seem, since DST and Standard time do not cancel out (for every +1 hour, there is a -1 hour), clock time and "nature" time, would not be in sync (AM would be night, and PM would be day).
How heck does this work out in the end?