Filtering A List Excluding Items That Appear Again

I've got two long columns of dates and names. The dates and names can repeat. Eg:

01/01/14
Fred

01/01/14
Joe

01/01/14
Tom

[Code] ........

I want to input a date and create a list of names with only the names from the date I enter and earlier, and excluding names that appear again with a later date.

E.g. if I enter 01/01/14 I'd get:

Joe
Tom

But not Fred, as although he appears on 01/01/14 he also appears with a later date too.