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How to convert epoch timestamp into date time string?

We are going to convert epoch timestamp into a date-time string.

function convertDateTime(timeStamp){
    var milliSecTimeStamp = 0;
    if(String(timeStamp).length <= 10){
        milliSecTimeStamp = parseInt(timeStamp)*1000;
    }else{
        milliSecTimeStamp = parseInt(timeStamp);
    }
    var dateTime = new Date(milliSecTimeStamp);
    var date = dateTime.getDate();
    var month = dateTime.getMonth();
    var year = dateTime.getFullYear();
    var dateFormat = date+'-'+month+'-'+year;
    return dateFormat;
} 
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