#LeapYearDay should be an additional Sunday, by design (📅👇).

Advantages:
✅ A 48h long Sunday!
✅ 0.07% of population quadruple birthdays* 🎂
✅ Calendars conveniently shift one day per year, irrespective of a leap year or not.

We have 4 years to make it happen!
(*if applied retroactively)