The old DST was not static in dates either - it was always the first Sunday in April to the Last Sunday in October. Now it is the Second Sunday in March to the First Sunday in November . . .
That's right, but it was that way for a long long long time.
This new change to DST was just a knee jerk reaction to an issue the US government thought they had, in reality it means nothing, other then a lot of headaches.
It's been proven in study after study that DST changes do not save any money, yet that was the impetus they used to shove this change through, it was a dumb move in 2005 when they approved it, a dumb move in 2007 when they implemented it, and 2 years later its' still dumb.