Setting in text citation format as default

I am using Endnote X7.7 for Mac.

I am using the Harvard referencing style which, as its default setting, should display a reference in text as:

author, date

However, I have added my references to my file and they have all been added as the  exclude year format instead of the default and hence are given as:

author

I need my references with the date included. I appreciate that I can change each of my references manually from exclude year to default but I have 456 indivudal citations of 250 references and so this would likely take a very long time! Is there a way to set this?

I have checked the output style in Output Style Manager and as far as I can see there is no way to change this (although I have almost certainly missed something).

Any help would be massively appreciated.