$year = date('Y');
$spring = date('m-d-Y 02:00:00 A',
strtotime('Second Sunday Of March '.$year));
$fall = date('m-d-Y 02:00:00 A',
strtotime('First Sunday Of November '.$year));
echo 'Spring: ' . $spring;
echo 'Fall: ' . $fall;
Here is the quiz of the day:How would you accomplish this on the Arduino?
Reference:
Arduino Time Libraries
Arduino DST Solution