Hi this is my first time posting.

I'm having difficulty figuring out the following on excel

Issue:
1) Column A is filled w/ duplicate values 1,1,1,2,2,3,3,3,3 3,4 etc
2) Column B holds various dates correlating to column A.

Desired Result:
the oldest date to appear in column C on the same row where that oldest date is located.

For example:
Value Date Result
1 9/1/2010 9/1/2010
1 9/31/2010
2 10/15/2008
2 1/11/2008 1/11/2008
2 4/15/2010
3 6/23/1995 6/23/1995