I found an inconsistence on Date() with a negative value.
I was looking on ES6 specification about this issue but I didn't found an answer, maybe the correct way is convert the -0 to +0
as V8 and SpiderMonkey do.
Steps to reproduce:
d = new Date(-0);
V8 and SpiderMonkey works as expected.
OS: Ubuntu 16.04 x64
Daily build v233772 not reproduce this issue