Automatically archive emails in Gmail after x days

autoarchive-mails

// how to use this
// 1. create a new script on https://script.google.com/home and paste over this code
// 2. define which emails you want to archive and after which delay (lines 7,8)
// 3. add a «project trigger» to define how often this script should be executed (e.g. every day at midnight)

function auto_archive_mails() {  
  var label = GmailApp.getUserLabelByName("News Briefings"); // Emails with which label do you want auto-archived? 
  var delayDays = 3 // After how many days do you want your emails auto-archived?   
  var maxDate = new Date(); 
  maxDate.setDate(maxDate.getDate()-delayDays);    
  var threads = label.getThreads();  
  if (threads.length > 0) {
    for (var i = 0; i < threads.length; i++) {  
      if (threads[i].getLastMessageDate()<maxDate){  
          threads[i].markRead(); 
          threads[i].moveToArchive();    
      } 
    }
  }
}

// adapted from https://www.maketecheasier.com/google-scripts-to-automate-gmail/amp/