Enhancing my gmail filters!

8hr delete.js

/**
 * Using Google Apps Script to enhance my gmail filters.
 * 
 * I constantly receive email that are important for a short period of time (When I order food online!!!!) but after
 * the email is no longer relative (When I get my food!) I have no need for this email. Sadly they tend to pile up on me
 * (I eat a lot).
 * 
 * Anyways you can add this 8hrDelete.gs file to https://script.google.com and set it up on a "Time Driven" trigger at what
 * ever time you'll like. I run it at midnight
 */

/**
 * Delete all emails tag with "8hr Delete" after 8hr of the last message.
 */
function processLabelInbox() {
  var lastDate,
      labelName = "8hr delete",
      cutOff = (60 * 60 * 8),
      currentDate = Date.now(),
      label = GmailApp.getUserLabelByName(labelName),
      threads = label.getThreads();
  
  for (var i = 0; i < threads.length; i++) {
    lastDate = Date.parse(threads[i].getLastMessageDate());
    if (lastDate <= (currentDate - cutOff)) {
      threads[i].moveToTrash();
    }
  }
};