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

//Month is 1 based
function daysInMonth(month,year) {
    return new Date(year, month, 0).getDate();
}

//July
daysInMonth(7,2009); //31
//February
daysInMonth(2,2009); //28
daysInMonth(2,2008); //29

Ref : http://stackoverflow.com/questions/1184334/get-number-days-in-a-specified-month-using-javascript


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