Lincoln's birthday

[Steve]

Is there any known early documentation of Abraham Lincoln's February 12, 1809 birth date or the birth date of his sister? Say, from either the extended Lincoln or Hanks famlilies? I'm aware of Lincoln giving his birthday at the start of his political career and the birth dates written in the Lincoln family bible (although those were written in Abraham Lincoln's own hand). Is there any documention that's earlier? The Lincolns were Baptists, so there wouldn't be any infant baptism records, and I doubt there would be any newspaper birth notices for that area of Kentucky at that time. I'm just wondering if there's any documention earlier than four decades after the fact.