The Chronologicon is a time tracker inspired by those of Neauoire, vi, and Josh Avanier. Its epoch is 170827 (27th August 12017).
The Chronologicon specifically logs focus hours — defined as any single hour in which at least 50 minutes are spent continually working. Shorter periods of work are not logged, so the actual time invested in any project is usually slightly longer than the logged hours. For the purposes of this tracker, however, I prefer a less granular data format.