Really? Your Nikon camera knows not just which day each year but what nation and what state/province/territory it, not you, is actually in??
Shazam! Maybe I should get rid of all four Sony cameras I own? Nah. Sorry, not to be nasty, but respectfully, I don’t believe your claim.
You are mistaken. My Nikon D810 has a menu item which allows me to set automatic daylight savings time. I use it.