My favorite mistake is when people assume it is only daylight savings time that you need to consider. I could just be on vacation in a different place, but sti

My favorite mistake is when people assume it is only daylight savings time that you need to consider. I could just be on vacation in a different place, but still want to keep the same schedule. And indeed, knowing that most places open around 9ish local time everywhere is very convenient. Another fun aspect of this topic is how people will tacitly jump around the definition of "day" being when the sun is up without confronting that that is, itself, not a given. And, worse, is completely thrown out if you try to abolish time zones.