Hi,
Please try using the below formula in your Date Object
CASE WHEN @Prompt('Enter Date','D',,mono,free,persistent,{'1900-01-01'}) = '1900-01-01 00:00:00' then DATE else
cast (@Prompt('Enter Date','D',,mono,free,persistent,{'1900-01-01'}) as date) end
Regds,
Hafeez