Your first point is technically correct, but 24-hour days and 7-day weeks are a de facto global standard at this point in history. There are outliers, like the Javanese 5-day week or the experimental 5-day Soviet calendar, but they are few and far between.
This is basically how the city of Richland, Washington came into its present form. During the Manhattan Project the federal government took over the town and some adjacent villages, evicting about 300 people, and built it into a bedroom community that eventually housed about 25,000 people for the nearby Hanford site.