If it's February 11 as you state, and his birthday is celebrated on the 3rd Monday of February, then his birthday is still not being celebrated on the actual day of his birth, only now it's much father away from the date it is actually celebrated.
There is no date you can pick where his birthday gets celebrated on a day that isn't actually his birth.
The point is that when people celebrate your birthday on a day that isn't actually your birthday, it isn't the end of the world. The celebration is what matters, not the exact date.
If it's February 11 as you state, and his birthday is celebrated on the 3rd Monday of February, then his birthday is still not being celebrated on the actual day of his birth, only now it's much father away from the date it is actually celebrated.
There is no date you can pick where his birthday gets celebrated on a day that isn't actually his birth.
The point is that when people celebrate your birthday on a day that isn't actually your birthday, it isn't the end of the world. The celebration is what matters, not the exact date.