dealing with NULL date fields in Crystall 2008

Morning Experts,

I'm working with a report that has Date Time criteria.  When an end user views a screen within the application that contains a Date or DateTime field it stores the default date of Jan 1 1800 in order to display the data as a Date or DateTime.  This means that for most records in the database these fileds are populated with either a true date, or 1800,1,1.  So when working with selection criteria to find records without certain date having been filled out we would use a formula such as:

{custom_loanmain.OptimumReimbDate} = DateTime (1800, 01, 01, 00, 00, 00)

This has been working fine for some time but recently we have an issue where the workflow of the user may allow them to never visit certain screens within the application and therefore these fields are not populated but remain NULL.  These records are then screened from the report as they do not meet the selection critera.  What would be the correct syntax to select records that are both NULL and = (1800, 01, 01, 00, 00, 00)?

ISBTECHAsked:
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peter57rConnect With a Mentor Commented:
isnull({custom_loanmain.OptimumReimbDate}) or ({custom_loanmain.OptimumReimbDate} = DateTime (1800, 01, 01, 00, 00, 00))

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ISBTECHAuthor Commented:
Thanks that worked perfectly!  I was doing it backwards:

{custom_loanmain.OptimumReimbDate} isnull
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