LaTeX forum ⇒ General ⇒ Want to create sorted list of Birthdays

[west.logan]

I'm creating something like a directory and it would be really nice to put each person's birthday information into something like an index and have it sorted and printed at the end. I envision something like

\birthdate{Bob}{January}{1} 
\birthdate{Tom}{February}{1}
\birthdate{Jill}{January}{15}
\birthdate{Alice}{January}{1}

Which would then be sorted into

January
1 Alice; Bob
15 Jill

February
1 Tom

Of course the months wouldn't be in alphabetical order, but calendar order. I've thought about trying to do it with an index but so far haven't been able to figure out how to make the index ignore page numbers and sort by dates. Any initial thoughts on a direction or package I should explore?