Using Calendar for better focus lately

In an earlier life, I operated with checklists in cockpits. I walked to those cockpits after attending pre-flight briefings two hours and 15 minutes from scheduled takeoff time. And when an aircraft commander, I ensured my crew had 12 hours and 15 minutes of uninterrupted crew rests. All these activities were calendar-based.
It’s taken me more than 20 years to return my daily activities to calendar-based routines. I tag some items as “focus” or “travel” or “pay” now.
Everything in its place.