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The Gregorian calendar, which now serves as the standard calendar for civil use throughout the world, has both common years and leap years. A common year has 365 days and a leap year 366 days, with the extra--or intercalary--day designated as February 29. A leap year occurs every four years to help synchronize the calendar year with the solar year, or the length of time it takes the earth to complete its orbit around the sun, which is about 365Â¼ days.
The length of the solar year, however, is slightly less than 365Â¼ days-by about 11 minutes. To compensate for this discrepancy, the leap year is omitted three times every four hundred years.
In other words, a century year cannot be a leap year unless it is divisible by 400. Thus 1700, 1800, and 1900 were not leap years, but 1600, 2000, and 2400 are leap years.
And, of course, the United States does have DST, unless you live in Puerto Rico, the Virgin Islands, American Samoa, Guam, the Northern Marianas Islands or, as mentioned before Hawaii and Arizona.
But Arizona isn’t even consistent within itself.
While Arizona ignores DST, the Navaho Nation inside of Arizona follows it.
Inside of the Navaho Nation is the Hopi Reservation which, like Arizona, ignores daylight saving time.
Going deeper, inside of the Hopi Reservation is another part of the Navaho Nation which does follow daylight saving time.
And finally there is also part of the Hopi Reservation elsewhere in the Navaho Nation which doesn’t.
So driving across this hundred-mile stretch would technically necessitate seven clock changes which is insane.
crazy things like a certain US state had 4 “time zones”.