People usually use calendars to schedule meetings or plan what to do where "in the future".

What I like to do is fill all 24 hours of every day in my calendar with what I did (rounded up to 15min blocks) so that I can check in the future. I plan days in advance like others, but as I live each day, I make sure all the calendar records "in the past" are accurate.

People around me don't seem to do this. I'm wondering if I'm alone in the universe, or if my habit is a niche one that I cannot find similarities offline in my life, but can on developer communities like HN.