Validation Rules - Nintex Mobile form

Validation Rules - Nintex Mobile form

Hi

I have a mobile form that requires a Date/Time Validation rule that ensures that the date supplied is in the past.

This currently works as a desktop from but as a mobile it does not.

I used the advice provided by Manfred Lauer in the thread @How to compare current datetime to a datetime field on form? 

The validation rule I am using is  greaterThan({Self},curr_date_time) Message "Test".

When the mobile form is used the item is submitted without any validation message appearing.

I have tested on an android and windows phone.

Any suggestions out there?

Thanks

Rob