Comment #50 on issue 1945 by [email protected]: call SetTime(0,0,0,0) and throws "this is not a Date object." if Date() object has been subclassed
http://code.google.com/p/v8/issues/detail?id=1945

I think this problem is fixed in Chrome Beta now.
Latest Chrome Beta has been updated to V8 v3.8.9.8.
And It is said that this would be fixed in V8 v3.8.9.7.
Install beta and try "var _d = new Date() ; for(var i=0;i<10000; i++) _d.setHours(0,0,0,0);".

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