I have a program that writes data to Outlook Task

In the Outlook Task I need the Date Task Completed field to be blank.
It is a datetime field

In VFP I am executing

.DateCompleted={}

but instead of an empty date I get the following

Mon 09/01/3454

The following works fine

.DateCompleted={18/02/2001}

If I try to use

.DateCompleted=.null.

I just get an error message so its not expecting a null value.

I have also tried storing an empty DatTime field to it (since it is a datetime field) and that has the same effect

Does anyone have an idea how I can get a blank date in there