Leaps (extras)

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Leap Hours
Leap hours are extra hour. Such in 2600 will look like in Agilent Technologies.

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Leap Seconds
Leap seconds are seconds that is negative or postive: for a negative 23:59:58, 00:00:00. Then the negative will omit the 59th second. Positive leap seconds are common. 23:59:59, 23:59:60, 00:00:00.
The most recent leap second was added in December 31, 2008. a positive leap second.
Note
Negative leap seconds are not used. there are used in future centuries, or millenia.
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Leap Minute
Leap minutes are rare. this looks like: 23:60:00. Same as the leap second 23:59:60.
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Leap years
A leap year is a year divisible by 4. The most recent is 2008. The next is 2012.
Century leap years are divisible by 400. but not 100. Examples are 1600 and 2000. but 1700, 1800, 1900 were not. The next is in 2400.
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Leap months/Leap weeks
A leap month consists of 13 months. or an extra month. It is only used in proposed calendars. such as CC&T Calendar. in leap years. 5 or 6 years is a leap week is Newton.
A leap week is an extra week, The most used leap week is 53rd week. but 51st week and 54th weeks are not.
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Future of leap seconds (10,000 years)
In a few tens of thousands of years (the timing is very uncertain) LOD will exceed 86,401 s, causing the current form of UTC to break down due to requiring more than one leap second per day. It would be possible to then continue with double leaps, but this becomes increasingly untenable.
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Wikipedia info (Leap second)
Please visit at http://en.wikipedia.org/wiki/Leap_second.
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More Information (Future except in 10,000 years)
As the Earth's rotation continues to slow, positive leap seconds will be required more frequently. The long-term rate of change of LOD is approximately +1.7 ms per century. At the end of the 21st century LOD will be roughly 86,400.004 s, requiring leap seconds every 250 days. Over several centuries, the frequency of leap seconds will become problematic.

Sometime in the 22nd century, two leap seconds will be required every year. The current use of only the leap second opportunities in June and December will be insufficient, and the March and September options will have to be used. In the 25th century, four leap seconds will be required every year, so the current quarterly options will be insufficient. Thereafter there will need to be the possibility of leap seconds at the end of any month. In about two thousand years even that will become insufficient, and there will have to be leap seconds that are not at the end of a month.
At that you can find at http://en.wikipedia.org/wiki/UTC#Future

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Now closed.