Customizing Your Credit Card Due Dates

You are probably aware of most of the tips in this CBS MoneyWatch article, Smart ways to be a more savvy credit card owner. However, I found this one interesting:

Set your own due date. Most credit cards let you specify the date you want to pay. It's very much in your best interest to take advantage of this -- you can align all of your credit cards so they're due on the same day

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Have you set the due dates of all of your credit cards? Do you have any that don't allow this?