Time slider accessing only certain months of a year

Discussion created by merlyn77 on Jun 5, 2014
I'm attempting to figure out how to go about using the dynamic time slider and instead of allowing access to all days between 1921 and 2009 like this code:
 timeExtent.startTime = new Date("1/1/1921 UTC");
          timeExtent.endTime = new Date("12/31/2009 UTC");

I would like to only access months 1,2,3,9,10,11,12 between years 1921 and 2009.

Any thoughts?