Comment by insane_dreamer

I went through the same process and now use a text file, or more accurately, I use a "canvas" in slack which is essentially a free-form text page with Markdown formatting (including check boxes that I can check). I make one page per month, with H1 headings for each day.

The reason I use this in Slack is that I already have Slack open all day and don't want to have YetAnotherWindowOpen. Also, I get sync between computers/devices for free.

This is just for the work I need to do that day. Otherwise we have YouTrack tickets; any meetings I set in Google Calendar.