Automatically archive unimportant emails after a week

gmailAutoArchive.js

// I run this on a timer from scripts.google.com. You'll need to manually approve permissions the first time you run it.

function gmailAutoArchive() {
  
  let delayDays = 7; // I use seven days; you can change the archival threshold in days by changing this number.
  
  let search = `in:inbox {-in:important category:social category:updates category:promotions category:forums} -in:starred older_than:${delayDays}d`;
  let offset = 0;
  let threadCount = 1;
  let limit = 100; // GmailApp bulk methods can only handle 100 threads at a time

  while(threadCount > 0) {
    let threads = GmailApp.search(search, offset, limit);
    threadCount = threads.length;
    console.log('Found ' + threadCount + ' threads with offset ' + offset);
    console.log('Marking as read ...');
    GmailApp.markThreadsRead(threads);
    console.log('Archiving ...');
    GmailApp.moveThreadsToArchive(threads);

    offset += threadCount;
  }
}