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by Superman

JavaScript

Year Difference: 2 end year: 2015 start year: 2015
78 Difference of days.
 12 : Selected Array Length 
 calendar0
 4
 2015/01/07
 2015/01/14
 2015/01/21
 2015/01/28
 4
 ["2015/01/07", "2015/01/14", "2015/01/21", "2015/01/28"]
 calendar1
 4
 2015/02/04
 2015/02/11
 2015/02/18
 2015/02/25
 4
 ["2015/02/04", "2015/02/11", "2015/02/18", "2015/02/25"]
 calendar2
 4
 2015/03/04
 2015/03/11
 2015/03/18
 2015/03/25
 4
 ["2015/03/04", "2015/03/11", "2015/03/18", "2015/03/25"]
 SELECTED ARRAY IS EMPTY.
 0,1,2 - 2015,2015,2015