Convert Unix timestamp to Date time with JavaScript

Convert Unix timestamp to Date time with JavaScript

<input type='text' value='1500028071' id='timestamp'>
<input type='button' id='convert' value='Convert' onclick='convert();'>


<span id='datetime'></span>
function convert(){
 // Unixtimestamp
 var unixtimestamp = document.getElementById('timestamp').value;
 var months_arr = ['Jan','Feb','Mar','Apr','May','Jun','Jul','Aug','Sep','Oct','Nov','Dec'];
 // Convert timestamp to milliseconds
 var date = new Date(unixtimestamp*1000);
 var year = date.getFullYear();
 var month = months_arr[date.getMonth()];
 var day = date.getDate();
 var hours = date.getHours();
 var minutes = "0" + date.getMinutes();
 var seconds = "0" + date.getSeconds();
 // Display date time in MM-dd-yyyy h:m:s format
 var convdataTime = month+'-'+day+'-'+year+' '+hours + ':' + minutes.substr(-2) + ':' + seconds.substr(-2); 
 document.getElementById('datetime').innerHTML = convdataTime; 
}

2020-03-02