Personally I write all my time to CalDav server for about 3 years now. Works great on all kinds of devices. Then I have a small python utility that can read the

Personally I write all my time to CalDav server for about 3 years now. Works great on all kinds of devices. Then I have a small python utility that can read the calendar file and parse time for selected words. For example I create event "DEVELOPMENT PROJECT_XY". Then python script calculates time for "PROJECT_XY"... Maybe I should publish that as open-source after some code review. Also I can review how much time I spend on personal stuff like house cleaning, cooking, shopping, or research and study...