Async with For Loop 2

node_omngodb_groups.js

var login_counts = [],
    j = 30;

for (;j > 0;j--) { 
  tday.setDate(tday.getDate()+1); 
  yday.setDate(tday.getDate()+1);

  // scope
  (function (index, query) {
    collection.find({date: query},function (err, cursor) { 
      cursor.count(function (err, count) { 
        login_counts[index] = count; 
      }); 
    });
  })(j, {'$gt':tday, '$lt':yday});
}