How to get a count of timestamp on 1 date

I have a tstamp column, looks like what I pasted below. How do I write a formula that will give me the total count of tstamp for say 4/1/2011? I want a total count of all the tstamp entries that have 4/1/2011.

TSTAMP
4/1/2011 14:47
4/1/2011 15:14
4/1/2011 15:15
4/1/2011 15:16
4/1/2011 15:17
4/1/2011 15:18
4/1/2011 15:18
4/1/2011 15:37
4/4/2011 13:32
4/4/2011 9:31
4/4/2011 9:30
4/4/2011 9:33
4/4/2011 13:32
4/4/2011 13:35
4/7/2011 9:23
4/7/2011 9:26
4/7/2011 9:27
4/7/2011 9:22
4/7/2011 9:31
4/8/2011 13:42
4/8/2011 11:01

Try this

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Select from the drop-down in the yellow cell to change the results

Hope this helps

[EDIT]
Added COUNTIFS to the attachment.

OR
=SUMPRODUCT(--(INT($A$1:$A$500)=C1))
where C1 contains your date

Or given OP uses 2010

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I have added this to the above attachment