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Checking data parameter is empty or null

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Last Modified: 2013-11-15
Hi,

I have a crystal report in which I want to allow the user to enter a date parameter, but if they don't I want to put in place a default date range.

My current code is attached.  I know I can't do the '' as the forumla expects a date type so won't compile and most likely the isnull is really only for checking database values, so thats prob out too, but it gives an idea of what I want to do.
//If no start date was given, then run the report for the reportPeriod of months from the given endDate.
if ( isNull({?Start_Date}) OR {?Start_Date} = '' ) Then 
    ( Date(DateAdd ("m",-{?reportPeriod_Months},cDate(year({@EndDate}), month({@EndDate}), 01))) ) 
else 
    {?Start_Date};

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