Just don't care and use them. People understand them. Maybe they're not used to hearing it, but it doesn't matter. This is what I do and never cam across someone who was so dense that he didn't understand me. I also never had someone tell me that it was strange to do so.
We wouldn't in America in most cases. I'd say it's August 9th 2023. I honestly feel like this is such a dumb argument to have because it doesn't matter except for communication with people who use other methods. Now metric vs imperial makes way more sense to me because the metric system is just so much easier for mathematical conversions.
In metric, one milliliter of water occupies one cubic centimeter, weighs one gram, and requires one calorie of energy to heat up by one degree centigrade—which is 1 percent of the difference between its freezing point and its boiling point. An amount of hydrogen weighing the same amount has exactly one mole of atoms in it. Whereas in the American system, the answer to ‘How much energy does it take to boil a room-temperature gallon of water?’ is ‘Go fuck yourself,’ because you can’t directly relate any of those quantities.
Lmao Europe is not the only place where they use metric (I'm not European).
Seconds are part of the metric system and are the base unit of time. Just because they didn't define it initially doesn't mean it doesn't exist or makes sense. They use milliseconds and kiloseconds; minutes and hours are used for convenience but are not part of the SI
This is actually often done when trying to be more eloquent or dramatic or add importance, like how Independence day is The 4th of July versus just saying Jily 4th.