Not really a stay of execution, but it is an extra day to get the 1040 prepared. And there I was busting my rear over the weekend to get mine ready.
Turns out not only did the 15th fall on Sunday, April 16th is Emancipation Day in Washington D.C., a holiday. So the true deadline is 4/17/18. If it's postmarked on or before 4/17/18 then it's on time.
On the down side, there will be no swamp draining on the 16th, either.
3:05 PM 4/16/2018