Hello - this can be frustrating when SAS doesn't recognize a column as a date. There are a couple ways to fix this.
In SAS Studio (Develop SAS Code), create a SAS dataset from your csv file (double-click & select Import) then create a new date variable from character variable. There is a community post that can help:
https://communities.sas.com/t5/SAS-Communities-Library/How-to-convert-a-character-value-to-numeric-in-SAS/ta-p/847645
As long as you save the resulting data in casuser, it should be available in Model Studio under available tab- you may need to load it to memory with the lighting bolt icon. If you don't see casuser as a library to save your data - run:
cas;
caslib _all_ assign;
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