Calculate percentage between two dates in JavaScript -

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i've been trying calculate percentage between 2 dates given code questions here in stackoverflow code doesn't work correctly. question: get percent of time elapsed between 2 javascript dates

var start = new date(2015,6,1), end = new date(2015,12,1), today = new date();  alert(math.round(( ( today - start ) / ( end - start ) ) * 100) + "%");

i want calculate progress 1rst of june 1rst of december , "-7"

please help! thanks

javascript counts months 0 11. january 0 , december 11. specified june december, entered 6 , 12.


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