Printing a report by date

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Question:  When I print a report for example Office Expenses.  I choose the time frame from January 1-February 28th.  If I go and post another entry today (March 15th) but post it using February 28th date, how can I have it appear in my time frame I specified above?  It seems to want to put it within my March inputs even though I use February 28th as the date.