access date object as array index

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jQuery

Here events is my global variable ..its an array. Event is my object with attributes text and classname (both are string). When I try to access event at date its gives null pointer exception...as in if the object isnt there?? or am I assessing it wrong? please its urgent

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events[new Date("04/21/2015")] = new Event("Valentines Day", "pink");
        alert("ev" + events[Date("04/21/2015")].text);