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https://or.wikipedia.org/wiki/Leap_second

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1972	+1	+1
1973	0	+1
1974	0	+1
1975	0	+1
1976	0	+1
1977	0	+1
1978	0	+1
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2014	0	0
2015	+1	0
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[1] ttp://www.bbc.co.uk/news/science-environment-33313347

[2] ttp://time.com/3666522/leap-second/

[3] ttp://www.washingtonpost.com/news/speaking-of-science/wp/2015/06/29/on-tuesday-the-world-gets-a-leap-second-are-we-all-gonna-die/

[4] ttp://indiatoday.intoday.in/story/nasa-earth-june-30-long-day-leap-second/1/447597.html

[5] ttp://www.theguardian.com/science/2015/jun/30/leap-second-to-pause-clocks-at-midnight-as-entire-planet-gains-a-second

[6] ttp://www.businessinsider.in/Google-found-a-clever-way-to-prevent-tomorrows-leap-second-from-crashing-its-computers/articleshow/47871169.cms

[7] ttp://www.wired.com/2015/06/just-drop-leap-second-unnecessary/

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