Comment #6 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

We are seeing the same error appearing in our app as well. It started with the upgrade from 16 to 17 that happened toward the end of last week. It is throwing the error in YUI's calendar-min.js (we were using 2.8.1 and have upgraded to 2.9.0 in an attempt to solve the issue - to no avail).

I have done some debugging and it appears that when YUI calendar is trying to use the Date object setHours method (as mentioned above) is when the error happens...see attached screen shot from the Chrome console.

Attachments:
        chrome-yui-calendar-date-type-bug.png  46.1 KB

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