Calculates all dates between input dates and gives dates every week for the week day by start date.

weekly-recurring-event-date-calculator.js

// working demo in here: https://jsfiddle.net/lehtu/awnuk9f1/

var moment = require('moment');

var start = '2016-01-01';
var end = '2016-12-31';
var weeks = moment(end).diff(start, 'week');
var dates = [];

for (var i = 0; i <= weeks; i++) {
  dates.push(moment(start).add(i, 'weeks'));
}

// just for seeing that dates are correct
dates.forEach(function(date) {
  console.log(date.format('YYYY-MM-DD : dddd'));
});

console.log("there is " + i + " week(s) between given dates");