This RapidWeaver Snippet shows today's date and all your friends' birthdays. And when there are no birthdays on this day, a different text shows up.
You can configure this text (or translate it in any language), reverse the month and day when you are a US user, and add as many names of your friends as you like.

When there's no birthday this text shows up (it's just an example):
When one or more friends have their birtday this text shows up (example):
Add as many names as you like.