How to calculate number of weaks between two dates in javascript?

How could I get the difference for two Date() objects in JavaScript, while only return the number of weaks in the difference?.

I struggle a lot to find the difference between two dates and finally a lots of googling i find the below solution :

var date = new Date("2017/04/04");

var year = date.getFullYear();

var month = (date.getMonth()+1 <10) ? "0"+(parseInt(date.getMonth())+1) : parseInt(date.getMonth())+1;

var day = (date.getDate()<10) ? "0"+date.getDate() : date.getDate();

var newdate = year+"/"+month+"/"+day;

var date1 = new Date(newdate).getTime();

var date2 = new Date().getTime();

var dif = Math.floor(date2-date1);

dif = Math.floor(dif/1000/60/60/24/7);



alert("Total number of weaks between date1 and date2 ="+dif);

You can check the above code. You will return the difference between the "2017/04/04" and Current date in weaks.



Output :

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