For Excel 2007 try
=COUNTIFS($A$3:$A$100,">="&DATEVALUE("1/1/2011"),$A$3:$A$100,"<" & DATEVALUE(" 2/1/2011"))
or you can put your beginning and end date into cells (i.e. B1 and C1) and simplify
=COUNTIFS($A$3:$A$100,">="& B1,$A$3:$A$100,"<=" & C1)
Does that do what you want it to?
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