I've recently had problems scheduling Windows Defender to scan (stick with me - I am on the correct board). So when I discovered the command line function I was able to schedule it in my extrernal scheduler. I've been using a free program called UK's Kalender for some time now. The UK stands for Ulrich Krebbs it's not just UK. You can store all of your diaried items, it creates reminders and you can schedule programs to run at specific times.
Recently when I updated there was a minor bug which I emailed Ulrich about. I got a personal response with a fix!
It's a great program totally free but you can donate if you wish (no strings).