Well if we're talking day to day life, when I ask someone what day it is, they're not going to say "It's December 12th 2023". They're just gonna say "The 12th" because it's true the month doesn't really matter day to day.

I think the only time people use the full date is on like official forms where the month is more relevant. Also this is America, we don't care about average people's day to day, just businesses and money and cheeseburgers