dateDiff

JavaScript

// datepart: 'y', 'm', 'w', 'd', 'h', 'n', 's'
Date.dateDiff = function(datepart, fromdate, todate) {	
  datepart = datepart.toLowerCase();	
  var diff = todate - fromdate;	
  var divideBy = { w:604800000, 
                   d:86400000, 
                   h:3600000, 
                   n:60000, 
                   s:1000 };	
  
  return Math.floor( diff/divideBy[datepart]);
}
//Set the two dates
var y2k  = new Date(2017, 5, 1);
var today= new Date();
console.log('Weeks since the new millenium: ' + Date.dateDiff('m', y2k, today)); //displays 625

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dateDiff

JavaScript

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