// We create an array of month names to lookup later.
var monthNames = ["January", "February", "March", "April", "May", "June",
  "July", "August", "September", "October", "November", "December"
];

// Get the data.start_time, which is in seconds, and multiply by 1000 to get into milliseconds. We gove the milliseconds number as input to the Date constructor function. We end up have an object/variable called session_date that is of type Date.
var session_date = new Date(1000*1476220872);

// We create the string that we want to append to the DOM. For month, we need to get the month name from the array we created above to map month numbers to month names.
var session_date_string = monthNames[session_date.getMonth()] + " " + session_date.getDay() + ", " + session_date.getFullYear()

// Log to console to make sure it looks as expected.
console.log(session_date_string)

// Append to the DOM with jQuery or rewrite to use vanialla JavaScript if preferred.
$('session-date').append(session_date_string)