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Why does a call to Javascript's Date library such as date.setMonth(date.getMonth()-1) return 142

Author Votes Δ
jfriend00 4 +0.31
Donald 1 +0.54
Omar Elawady 1 -0.08
Mihai Alex 1 +0.44
James Gould 0 -3.39
Last visited: Jan 2, 2016, 2:56:02 PM