Back to the Invoices Page.
'Date' is when the invoice was generated.
Typically, all of the dates will be on the same day of the month. In this example, the customer may have changed wash clubs or re-signed up on a different day after billing failed. The last bill was generated on January 6, whereas before that, they had been on a billing cycle of the 26th of every month. I assume they switched wash clubs or had a change on their family plan billing.