Alpha - to get it to sort chronologically you'd need to do YYYY-MM-DD

The method you outlined is flawed because you could end up with something like this

01-14-2007
01-14-2008
01-14-2009
02-14-2007
02-14-2008
02-14-2009
03-14-2007
03-14-2008
03-14-2009