View to check overlap

gistfile1.js

function(doc) {
     if (doc.type && doc.type === 'commission' && doc.affiliate_network && doc.begins && doc.ends) {
       var current = doc.begins.split(/-/);
       var ends = doc.ends.split(/-/);
       var current_date = new Date(parseInt(current[0], 10), parseInt(current[1], 10) - 1, parseInt(current[2], 10) + 1); // javascript month starts at 0
       var ends_date = new Date(parseInt(ends[0], 10), parseInt(ends[1], 10) - 1, parseInt(ends[2], 10) + 1); // javascript month starts at 0
       while( current_date < ends_date){
         emit([doc.network, doc.provider, current_date.getFullYear(), current_date.getMonth()+1, current_date.getDate()], null);
         current_date = new Date(current_date.getTime() + 86400000);
       }
     }
   }