Many BalloonsRemembering birthdays without Facebook
Facebook removed its birthday calendar export in 2019. Get the dates out once, then let something else do the remembering.
Birthday guides
How to keep track of the birthdays you actually care about — on an iPhone, without checking Facebook, and without a reminder you set once and never saw again.
Seeing birthdays in the iPhone Calendar
Turn on the iPhone's built-in Birthdays calendar, understand where it gets its dates, and see what it cannot do.
When a birthday reminder never arrives
The four reasons an iPhone birthday alert silently never fires, and how to tell which one you have.
Importing birthdays from Google Calendar
Why a Google account's birthdays often don't appear on an iPhone, and the two routes that get them there.