I should preface by saying I know nothing about scripting. I found this script online that fit my needs, so I was able to re-purpose it for my project. Anyway, this script takes Google form submissions, populates a Google doc template, that template gets copied, converted to PDF, and placed in a specific folder on my Google Drive.
So my question is, I have a simple line that pulls the current date when the script gets run, but I also need some code that can calculate the current date plus 5 weekdays (which should exclude weekends), but I also need it to exclude defined holidays. Any help would be greatly appreciated.
// Work Order
// Get template from Google Docs and name it
var docTemplate = ""; // *** replace with your template ID ***
var docName = "Work Order";
// When Form Gets submitted
function onFormSubmit(e) {
  //Get information from form and set as variables
  var email_address = "";
  var job_name = e.values[1];
  var ship_to = e.values[11];
  var address = e.values[12];
  var order_count = e.values[7];
  var program = e.values[2];
  var workspace = e.values[3];
  var offer = e.values[4];
  var sort_1 = e.values[5];
  var sort_2 = e.values[6];
  var print_services = e.values[10];
  var priority = e.values[13];
  var notes = e.values[14];
  var formattedDate = Utilities.formatDate(new Date(), "EDT", "MM/dd/yyyy");
  // Get document template, copy it as a new temp doc, and save the Doc's id
  var copyId = DriveApp.getFileById(docTemplate)
    .makeCopy(docName + ' for ' + job_name)
    .getId();
  // Open the temporary document
  var copyDoc = DocumentApp.openById(copyId);
  // Get the document's body section
  var copyBody = copyDoc.getActiveSection();
  // Replace place holder keys,in our google doc template  
  copyBody.replaceText('keyJobName', job_name);
  copyBody.replaceText('keyShipTo', ship_to);
  copyBody.replaceText('keyAddress', address);
  copyBody.replaceText('keyOrderCount', order_count);
  copyBody.replaceText('keyProgram', program);
  copyBody.replaceText('keyWorkspace', workspace);
  copyBody.replaceText('keyOffer', offer);
  copyBody.replaceText('keySort1', sort_1);
  copyBody.replaceText('keySort2', sort_2);
  copyBody.replaceText('keyPrintServices', print_services);
  copyBody.replaceText('keyPriority', priority);
  copyBody.replaceText('keyNotes', notes);
  copyBody.replaceText('keyDate', formattedDate);
  copyBody.replaceText('keyDue', expirationDate);
  // Save and close the temporary document
  copyDoc.saveAndClose();
  // Convert temporary document to PDF by using the getAs blob conversion
  var pdf = DriveApp.getFileById(copyId).getAs("application/pdf");
  // Attach PDF and send the email
  var subject = "New Job Submission";
  var body = "Here is the work order for " + job_name + "";
  MailApp.sendEmail(email_address, subject, body, {
    htmlBody: body,
    attachments: pdf
  });
  // Move file to folder
  var file = DriveApp.getFileById(copyId);
  DriveApp.getFolderById("").addFile(file);
  file.getParents().next().removeFile(file);
}