Get a Sharepoint ListItem Based on Date? - c#

I have a Sharepoint List which is sorted by a Report Date.
Within a Visual Webpart I have created an html report which references the ListItems. One of the options on this Webpart is to change the date. If the user changes the date I need to be able to retrieve the ListItem corresponding to that Date from the List. Using c#, how can I get a handle on the Item in this way?
Thanks

I think you have your answer here
http://snahta.blogspot.com/2009/04/getting-list-item-updated-in-past-few.html
Few more good tips # http://snahta.blogspot.com/2009/07/spquery-few-important-things.html

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