Log Past has been rebuilt. Past sessions now use the real recorded UV for the day and place you pick, rather than an estimate based on today's weather. Morning readings were also being shown in reverse outside Europe, so a sunny 9am looked like darkness. That is fixed. The estimate and Save button now always appear. Previously, if the calculation came out at zero the entire panel vanished, leaving no way to save a session. When a period genuinely produced no vitamin D, the app now says why.

Fixes a bug where ending a session without saving it still counted toward your daily dose. If you started a session by accident, this could reduce your absorption rate for the rest of the day. Cloud cover now adjusts UV using the live forecast instead of a fixed curve, so the rate you see better reflects the sky overhead. Burn time also updates correctly when you change the cloud slider. Your year of birth has moved into a new Settings screen, reached from the gear in the top left. You can enter it yourself or import it from Apple Health. Logging a past session no longer affects today's rate, and charts stay readable at larger text sizes.