Accounts tab > Select the card > The pencil button
The payment date indicates the date when you receive the billing from your credit card bill.
The settlement date indicates the date when the division between payable balance and outstanding balance occurs.
A typical credit card issuer allows users to decide the payment date. So, if you set the settlement date is the 15th of every month, the payable balance would be the expense amount between the 15th of the last month to 14th.
Other expenses occurred later, it would be considered as an outstanding balance.
For example, if you set up the settlement date to the 15th of each month and today is 19th Mar.,
Payable Balance: 15th of Feb. ~ 14th of Mar.
Outstanding Balance: 15th of Mar. ~ 14th of Apr.
And then, on the 15th of May,
Payable Balance: 15th of Mar – 14th of Apr
Outstanding Balance: 15th of Apr – 14th of May
Please ensure that if there is an outstanding balance prior to the settlement of payable balance or additional charges occur, these amounts will be included in the payable balance.
Therefore, the settlement date indicates the beginning of your calendar month in terms of payable balance.