Microsoft Access 2010 - Timesheet database Catch overlap time entries except for

I have a database that employees enter their time on a certain project and it will warn them if they submit the time and it overlaps the time on another project. For example I enter 7/29/2013 7:00 AM start time and enter 7/29/2013 8:00 AM stop time. Then on another project I enter 7/29/2013 7:50 AM start time and enter 7/29/2013 9:00 AM it is a conflict. (7:50 to 8:00) Works great no issues. Now they want to be able to enter start time 7/29/2013 8:00 AM and stop time 7/29/2013 9:00 AM and this not being a conflict.  What is the best way to handle this.
Here is the current query.
SELECT tbltimesheet.EventID, tblEvent_1.EmpName, tbltimesheet.LocationID, tbltimesheet.Starttime, tbltimesheet.Stoptime, tbltimesheet.Sel, tbltimesheet.systemnotesid
FROM tbltimesheet INNER JOIN tbltimesheet AS tblEvent_1 ON tbltimesheet.EmpName = tblEvent_1.EmpName
WHERE (((tblEvent_1.EmpName)=networkusername()) AND ((([tblEvent_1].[Starttime]>=[tbltimesheet].[StopTIme]) Or ([tblEvent_1].[StopTime]<=[tbltimesheet].[Starttime]) Or ([tbltimesheet].[EventID]=[tblEvent_1].[EventID]))=0))
ORDER BY tbltimesheet.Starttime;
Thanks for all the help.
marlind605Asked:
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Jim Dettman (Microsoft MVP/ EE MVE)Connect With a Mentor President / OwnerCommented:
and just to be clear, the check is:

WHERE (existing start date) <= New END Date AND (existing end date) >= New START date


 New END / START would be the time sheet your just entering.

Jim.
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Rey Obrero (Capricorn1)Commented:
check if the method used here,
 http://support.microsoft.com/?kbid=245074 is applicable to your  problem..
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marlind605Author Commented:
capricorn1 from the website I see "By subtracting 1 day from the reservation checkout date, you can book a date that is the last day of an existing reservation. " How would I change the query to allow for the same time?
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Jim Dettman (Microsoft MVP/ EE MVE)President / OwnerCommented:
Please read the following:

http://www.experts-exchange.com/Microsoft/Development/MS_Access/Q_28176550.html#a39301783

It's exactly what you need.

Jim.
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Jim Dettman (Microsoft MVP/ EE MVE)President / OwnerCommented:
This comment is probably the most consise in expaling the logic required:

http://www.experts-exchange.com/Microsoft/Development/MS_Access/Q_28176550.html#a39301962

Jim.
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marlind605Author Commented:
Jim, that was awesome. Thank you.
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