custpmer exit problem - Critical

Hi,,

I have scenario where user wil enter the FROMdate & TOdate...

in my report i have to select table records whihc has 'Tstartdate' & 'Tenddate' with the following logic...

all reords with 'Tenddate' not before 'FROMdate'

and 'Tstartdate' not after 'TOdate'

logic:

'Tstartdate'<= 'TOdate' OR 'Tenddate' >= 'FROMdate'

how to write customer exit for this?

Regards,

Naveen