Board Thread:Questions and Answers/@comment-86191-20150224171429/@comment-3361105-20150224172718

Zero Hour was - like Flashpoint, a rewriting of the timeline - not a multiversal upheaval like CoIE or Ifinite Crisis.

Events that revised the DC Multiverse:

Crisis on Infinite Earths, Zero Hour, Infinite Crisis, Flashpoint, and probably Convergence.

But the thing to be aware of is that "New Earth" was not destroyed at any point between CoiE and Flashpoint. At least... I think that's true.