Format JavaScript date to common western string format (e.g. September 10, 2019)

format-js-date.js

// Date formatter function

function formatDateString(dateExecutionVar) {
  var date = new Date(execution.getVariable(dateExecutionVar));

  var monthList = ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'];

  var month = monthList[date.getMonth()];
  var day = date.getDate().toString();
  var year = date.getFullYear().toString();

  return month + ' ' + day + ', ' + year;
}

execution.setVariable('Formatted_Date', formatDateString('Date'));