ArcGIS Portal Feature Service Date Where Queries Confusion

Hi,

I have a host feature layer on Portal 10.8.1 and want to use a date where query.

Documentation from ESRI point to being able to use Intervals in the query but when I try to use in the Portal Feature Service reader the server returns a 400 error.

https://www.esri.com/arcgis-blog/products/api-rest/data-management/querying-feature-services-date-time-queries/

It appears you can only use a proportion of a day in the FME query. The help page FME desktop points you to from ESRI isn't exactly that informative.

https://doc.arcgis.com/en/arcgis-online/reference/sql-agol.htm

Is this a Portal versus AGOL difference?

This works:

"created_date" >= CURRENT_TIMESTAMP() - 0.015

This doesn't:

"created_date" >= CURRENT_TIMESTAMP - INTERVAL '15' MINUTE

If anyone can point me to a definitive page with the documentation for where datetime queries for hosted Portal feature layers.... 😀

Thanks,

Peter