Find Leap Years

By using LeapYearQ with DateDifference, you can find leap years and the intervals between them.

Find the leap years that occur from 1600 to 2012:
Find the intervals between them:
While leap years most commonly come in four-year intervals, they sometimes come every eight years. This is because a traditional leap day every four years is actually a slight overcompensation in the calendar. Thus, a leap year is skipped every 100 years when those years are not divisible by 400:
Find the years where an eight-year interval between leap years exists: