I have a  American Express ZYNC card.

To date, I have always paid the balance due in full
on (or before) the date on the payment stub
labeled "PLEASE PAY BY:"

I spoke with a CSR today at AMEX who informed me that
the "Please pay by" date is not the real "due date"
..that I really had until the day before my next billing
cycle ended to pay in full and avoid any charges.

In my case the dates are something like this:

The "please pay by" date is 05/26/11

The day before my next billing cycle ends is 06/26/11.

Is this correct?

Can someone tell me the real scoop on AMEX payment dates?