Ask HN: Personal Activity Tracker

I've come to realize that I should be tracking the time I spend on work and non-work activities with the goals of a) being able to analyze how I spend my time and b) drive improvements in my life-management. I've looked around the Internet and there are tons of tools in this space, so I wanted to ask the community here what they're using. My list of requirements:

- Able to track the time I spend on an activity manually, this includes the date the activity occurred.

- Activities need to be categorized (meeting, 1:1, speaking at a webinar), either using tags or some field.

- Activities need to have a context (what project or effort is the activity for),

- I need to be able to analyze the data by activity type, activity context, time spent. At a minimum a CSV export would work. If it can generate graphs that's a bonus.

- I own the data. Due to security requirements the app either needs to be stand-alone running on my system (Windows) or something I can self-host.

- I'm not looking for project management software, I already have that supplied at work.