GM! PSA for Sun Maxis and Sun Maxi Wannabes.
D Opportunity from the sun is slowly closing in northern hemisphere.
Where I am, we have only 31 days left this years!
Stay tanned, stack rayes 
Discussion
What app is that? I've got dminder on Android (works great, calculates vitd absorption over time per given body exposure) but few friends asked about something similar for apple devices.
That's exactly dminder: https://apps.apple.com/pl/app/d-minder-pro/id547102495?l=pl