Counting number of findings of a certain month and year

I would like to have a formula calculating number of findings of January 2011 in a table.
I am enclosing an example.
I have tried a combination of SUMPRODUCT(--(YEAR ... with IF and AND, but I am stuck.
Can anybody help me ?
Saturn

Perhaps

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or eventually a Pivot Table

hi Saturn, maybe:
=SUMPRODUCT(--(TEXT(B3:B6,"mmyy")="0111"))

or in Excel 2007 & above:
=COUNTIFS(B3:B6,">="&--("1jan2011"),B3:B6,"<="&--("31jan2011"))