SyntaxFix

[javascript] Get number days in a specified month using JavaScript?

The following takes any valid datetime value and returns the number of days in the associated month... it eliminates the ambiguity of both other answers... 

 // pass in any date as parameter anyDateInMonth
function daysInMonth(anyDateInMonth) {
    return new Date(anyDateInMonth.getFullYear(), 
                    anyDateInMonth.getMonth()+1, 
                    0).getDate();}

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