Test for month or day in date

Back in 2011 and 2014 there was a discussion on this issue. Have there been any changes? (https://forums.zotero.org/discussion/11912/test-if-issued-date-contains-month-and-day)
I need to be able to style a date so that it will only show if the issued date contains a month or a day. In other words I want to suppress the date if all we have is a year. We need a year as the second field of the reference and then the full issued date at the end. But if its just a year, we do not want it again. Is there any way to achieve this in the latest CSL? Ideally I need to be able to put a datepart into an If statement. Otherwise any suggestions for workarounds will be most welcome.
We are not using a published style. I made one from scratch and this is something I can not figure out. I can make some unused field available to indicate a "Suppress date" but would then have to get this into many thousands of records across multiple document types.

Thank you
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