The day of the week for the specified date

getWeekDay(date) function returns the short form of the day of the week for given date(ex: ‘Sun’, ‘Mon’, ‘Tue’…, ‘Sat’). 
function getWeekDay(date) {
    var days = ['Sun','Mon','Tue','Wed','Thu','Fri','Sat']
    
    return days[ date.getDay() ]
}

var date = new Date(2015, 0, 1)  // 1 Jan 2015
alert( getWeekDay(date) )        // 'Thu'
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