example-1-2.js

var data = [];
// this is our data array

var startingDate = new Date(2012, 8, 18);
// this is a date object

for (var i = 0; i < 10; i++) { // loop 10 times to create 10 data objects

    var tmpObj = {};
    
    // this is a temporary data object
    tmpObj.date = new Date(
        startingDate.getFullYear(),
        startingDate.getMonth(),
        startingDate.getDate()+i
    );
    
    // the data for this data object. Increment it from the starting date.
    tmpObj.DAU = Math.round(Math.random() * 300); // random value. Round it to a whole number.
    
    data.push(tmpObj); // push the object into our data array
}