My terminal now tells me when I'll finish the book I'm reading.
I spend my days in a terminal and my evenings reading, so I built oku: an open-source terminal app for Hardcover, the book-tracking site.
This week's release adds pace forecasting:
→ "24 pages/day · ~4 days left (≈ Saturday)"
→ "4 books behind · 0.8 books a week gets you to 20"
The arithmetic was the easy part. The interesting part was a time zone bug.
Hardcover stores dates like 2026-10-20, with no time and no zone. Go reads that as midnight UTC, which in New York is 7 p.m. the day before. So for everyone west of London, every book looked a day older than it was, and a reading goal ending on 31 December "expired" at 7 p.m. that evening.
The fix: a bare date means that calendar day wherever you are, so never convert it to local time.
If you store dates without times anywhere, it's worth checking.
I wrote up how the forecast works and how I tracked down the bug.
How the forecast works, and the UTC-midnight bug: [https://kameleon21.github.io/Personal-Website/blog/oku-pace-forecasting/]
The code (MIT): [https://github.com/Kameleon21/oku]
