Setting A Range Of Fill Dates

I have a certain number of accounts for opening and close dates. What I wish to acheive is to fill a Range of date from the opening to the closing (or up to 200606 YYYY-MM) in another spreadsheet with the account number corresponding to that date next to it.

The VBA I have right now manages to create the list of accounts but up till 2006. It isnt taking into consideration the closing dates of accounts.

So For example What I want is to set up inside of the loop that to continue to do the loop until it reaches the closing date by YYYY-MM so if the clossing date is 200504 I will have data filled up to that date, and if the closing date is "" then fill the dates up til 200606. Ive tried out a number of ways of inserting the if statement but apparently the string create a problem.

Here is my current VBA and a Sample Sheet of what it looks like....