Under the guidelines established by generally accepted accounting principles (GAAP), financial data —and by extension, financial reports—are organized according to accounting periods. Accounting periods create a pre-defined and repeatable structure for financial reporting. The accounting cycle itself depends on accounting periods to facilitate the (typically) monthly and also annual auditing and closing of the books. Accounting periods are usually defined as monthly, quarterly, and yearly time frames. Financial reports follow the structure of the accounting periods—and so you have monthly, quarterly, and annual reports. Ad hoc reporting outside the boundaries of the defined accounting periods is not generally supported.