[NetMonkey]

I build Danish self service web applications, and from my perspective I would always want to control that date formats fits the displayed language.

Why must it then be in Danish? Because we would rather optimize for Danish users who for some reason have gotten the wrong browser version / localization settings and don't know how to change it.

An English speaking user would be much better served with a dedicated English version than just the date format being correct - if they can overcome the language barrier, surely they can overcome the date format.