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The core idea for the app was to make it behave as if it was part of iOS. Like how iOS creates a "Birthdays" calendar when you add a birthday to a contact, and then shows a reminder on the day (or before). 🎂📆 (1/4) #BuildInPublic #Dev #IndieDev #iOS #iOSDev #Swift #App #AppDev #AnniversaryReminder

That's what I wanted @keepdates.app to do - but for everything else. Anniversaries, custom dates, all the random meaningful moments - all handled the same way. 👤→🗓️ And I wanted all to happen automatically - no need to open the app after set up. ✨ (2/4)

So I used the BGProcessingTask to periodically check if any of the dates in Contacts have changed, and keep everything in sync. When a new date is added, it will appear in the calendar automatically - usually overnight, when the phone is charging. 📱💤 (3/4)