Dates problem

[John Cochrane]

I am new to Valentina so please forgive me if I am asking a stupid 
question.
I cannot enter data into a date field with Applescript despite trying 
many ways of formatting the date

I simplified it to a one column table and used-
make new record with data {"30/05/1971"} at end of Customers.
All that is entered is "0000000000"

Data will enter into other field types fine. I have the "Date" type 
selected for the field and I am using the same date format as my system 
and date separators.

What am I missing?

John Cochrane