api.js

var API = {
  fetchSummary: function(date, completion) {
    date = date || new Date();
    var self = this;
    $.ajax({
      url: '/tweets',
      type: 'GET',
      data: {
        date: date.toString(),
        offset: -(date.getTimezoneOffset())
      },
      success: function(response) {
        completion(response);
      },
      error: function(error) {
        console.log(error);
      }
    });
  }
}