Thanks for the quick response.
My goal is to apply conditional logic based on how long ago the ABN / GST was registered.
One way would be to display the YYYY, MM, DD as three separate number fields. This would then allow to do conditional logic such as:
I.e. show a field if YYYY < 2014
As a side note,it is also worth noting that if a company is not regisitered for GST, the date shows as 1970-01-01