crossfilter: how to extract time information from start date and end date columns -


i have list of projects start date , end date in separate columns. want show how many projects in each month on bar graph. each project required counted on each month between start , end month can see how many projects still active in each month. data looks below.

projects,start date,end date
project 1,6/10/2013,5/31/2014
project 2,6/13/2013,2/14/2014
project 3,6/16/2013,6/15/2014
project 4,6/20/2013,3/31/2014
project 5,6/21/2013,3/20/2014
project 6,6/21/2013,3/31/2014
project 7,7/1/2013,1/1/2014
project 8,7/1/2013,3/30/2014
project 9,7/1/2013,6/30/2014
project 10,7/1/2013,12/31/2014
project 11,7/15/2013,1/15/2014
project 12,7/16/2013,3/31/2014
project 13,8/15/2013,2/15/2014
project 14,8/27/2013,3/31/2014
project 15,9/1/2013,10/31/2014
project 16,9/2/2013,2/28/2014
project 17,9/2/2013,12/31/2014
project 18,9/7/2013,12/31/2014
project 19,9/10/2013,3/9/2014
project 20,9/13/2013,3/31/2014
project 21,10/1/2013,3/31/2014

in excel prepare data graph below (for year 2014)
jan, 12
feb, 11
mar, 9
apr, 4
may, 4
jun, 4
jul, 4
aug, 4
sep, 4
oct, 4
nov, 3
dec, 3

(as newbie in stackoverflow, cannot post sample graph anyway hope can see want data prepared graph.) how crossfilter.js?

regards knw


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