Apple's Fiscal (Payment) Calendar
Apple, unlike other app stores, uses a custom payment calendar where months don't start on the 1st and don't end end 30/31 days later. Instead of using standard calendar months, Apple set up its own fiscal calendar and uses it to pay developers.
The Payments report automatically uses this calendar to report estimated and actual payments, so you don't have to change anything.
Here's the calendar for 2021:
Apple's fiscal calendar is based on the following rules:
- Every month starts on a Sunday and ends on a Saturday.
- The first quarter starts at the end of September.
- Every quarter starts with a 5-week month, followed by two 4-week months.
Apple's version, in App Store Connect (login required)