The %NumberDate% token returns the current date in a localized numeric format.
Prior to Mojave, and after Keyboard Maestro 9.0, dates should be in your chosen language. Unfortunately Apple changed Mojave and later to make the system return dates only in the Keyboard Maestro localized language (ie, English), regardless of your chosen locale. Keyboard Maestro 9.0 works around this by claiming to be in all locales, even though it is really only localized for English itself.