Re: "Fall Creators Update"
Hell, it's a single call in the Standard C Library (ISO 9899-1999 7.23.3.5). You can do it portably in any program that supports calling the C library.
It's a single method invocation in standard Javascript, too (ECMA 262 5.1 15.9.5.6).
There's no excuse for Teams not formatting dates according to the current locale. It's either complete incompetence or utter arrogance.