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The next Leap(26th leap) Second will be on 30 June,2015. The last one was on 30 June,2012.
What Is It?
Earth's rotation is slowing down around it's own axis, so we need to Leap a few seconds to catch up. Occasionally seconds are added to UTC to compensate for its drift from the Solar Mean Time or UT1. UTC (Coordinated Universal Time) is followed universally which approximates to UT1.
Who Will Be Impacted?
Anyone who relies on modern computing devices for their services and have strict time dependencies on it may be affected.
How Will You Be Impacted?
The 25th Leap reported plenty technology failures where the leap was not smooth. To avoid this, proper planning is required. Exact time for Leap is at GMT 23:59:59 on 30th June,2015.
The adding of a second to the Computer Systems gets complex. In systems, it may happen to report the earlier second '60' or may double show earlier second '59', this can create chaos and overprocessing CPUs.
Some Impact In 2012:
How To Deal?
Some Sites Guiding Fixes:
Linux Platforms -
Next Steps-The International Telecommunications Union will vote in November for abandoning the Leap Second. What are you views on this?