How to Add a Layer with Date Parameter to a WebMap

Question

Using ArcGIS Online WebMaps is there a way to add a parameter with the value for the current date?
I have a WMS endpoint of: 
http://cwfis.cfs.nrcan.gc.ca/geoserver/public/wms?SERVICE=WMS&VERSION=1.3.0&REQUEST=GetMap&FORMAT=image%2Fpng&TRANSPARENT=true&LAYERS=public%3Afdr20180602sf&STYLES=cffdrs_fdr_opaque&CRS=EPSG%3A3978&BBOX=-3991710.1904940302%2C-2088685.5647933884%2C4796240.926562594%2C4089697.908348535

And as you'll note there is a current date in the URL (in bold).  Is there a way to add the current date in the YYYYMMDD format to the parameter values via WMS OGC options?

Thanks,

Neil

KellyGerrow · Answer

Try using custom parameters if there is a key pair relationship for this parameter:

Improved OGC Client Capabilities using Custom Parameters (September 2016)

Add layers—ArcGIS Online Help | ArcGIS

-Kelly