Bookmarklet to automatically set Trello card times to just before midnight whenever the due date is accessed...unless they're in a column called "Meetings"

trello-auto-midnight-all-but-meetings.js

javascript:(function () {

  const set_time_to_midnight = (a,b) => {
    if (!document.querySelector('.js-open-move-from-header')
      || document.querySelector('.js-open-move-from-header').innerText === 'Meetings'
      || !document.querySelector('.js-dpicker-time-input')) return;
    document.querySelector('.js-dpicker-time-input').value = '11:59 PM'
  };
  
  const config = { childList: true, subtree: true };
  let bootstrap_observer;
  
  bootstrap_observer = new MutationObserver(set_time_to_midnight);
  bootstrap_observer.observe(document.getElementById('trello-root'), config);
  
  
})();

Unfortunately, a recent Trello update has broken this, but also made it more complicated to fix. Simply updating the query selector doesn't do the trick, because changing the .value only changes what's displayed, and not what is sent when you click Save.