There are many good answers here, but have you heard of the Chinese Room thought experiment?

en.wikipedia.org/wiki/Chinese_room

That’s basically what LLM interfaces are, albiet with a calculator + “fuzzy” dictionary inside. The current chat is an LLM’s entire view of the world; otherwise it’s like a clone taken out of a vat into a black box, frozen in time forever.

Better LLM interfaces will inject relevant context (like the date) into the context, but ChatGPT is especially poorly made, and no one should be using it over alternatives unless your work makes you do it.