# ioBroker - Javascript Tipps

Date.prototype.getWeekNumber = function(){
    let d = new Date(+this);
    d.setHours(0,0,0);
    d.setDate(d.getDate()+4-(d.getDay()||7));
    return Math.ceil((((d-new Date(d.getFullYear(),0,1))/8.64e7)+1)/7);
};

var date = new Date();

log(date.getWeekNumber());

function isEquivalent(a, b) {
   // Create arrays of property names
   var aProps = Object.getOwnPropertyNames(a);
   var bProps = Object.getOwnPropertyNames(b);

   // If number of properties is different,
   // objects are not equivalent
   if (aProps.length != bProps.length) {
      return false;
   }

   for (var i = 0; i < aProps.length; i++) {
      var propName = aProps[i];

      // If values of same property are not equal,
      // objects are not equivalent
      if (a[propName] !== b[propName]) {
         return false;
      }
   }

   // If we made it this far, objects
   // are considered equivalent
   return true;
}