For VA, there are two locales. The locale setting for your browser determines the client side locale. The locale for the CAS server determines the locale for data processing.
I am not an expert on Viya admin so I am not sure of the best way to set the CAS locale. I see a LOCALE= session option when I search, but I'm not sure if that is what you need.
Sam
This topic might be helpful.
Configure the Machines > Configure Locale and Encoding
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