Don't let that answer confuse you. It seems to be phrased in an intentionally confusing way, but it's really only talking about time zones. At midnight 1970-01-

Don't let that answer confuse you. It seems to be phrased in an intentionally confusing way, but it's really only talking about time zones. At midnight 1970-01-01 UTC, Los Angeles, North America, and roughly half of the world still had their calendars on the previous day, because they have a negative time zone offset (Los Angeles was UTC-8:00).