My attempt at detecting EST/EDT change automatically

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I think it is easier to use a simple function:

called like this at the start of loop():

void loop(void) {
  Time.zone(IsDST(Time.day(), Time.month(), Time.weekday()) ? summerOffset : winterOffset);
  // etc...

for europe:

bool IsDst(int day, int month, int dayOfWeek)
{
  if (month < 3 || month > 10)
  {
    return false;
  }
  if (month > 3 && month < 10)
  {
    return true;
  }
  int previousSunday = day - dayOfWeek;
  if (month == 3)
  {
    return previousSunday >= 25;
  }
  if (month == 10) return previousSunday < 25;
  {
    return false;
  }
}
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