cooper collier 5/30/2017 10:31:54 AM I did a quick test on this issue and you are correct there is no way to search for null.
Teamdesk may or may not be able to add this feature. Until that time.. this is a quick and easy alternative way to do the same thing.
Create a new formula checkbox column. - "null-date" put the following formula in it IsNull([test date]) - of course replace [test date] with the actual date column.
Hide the [null date] column from your views and forms.
Now add the [null date] to the 'ask the user'
Depending on how you are using the filter this may actually be easier for users.
Please let me know if this helps or if I am totally "off base"
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