You can edit an accounting period as long as it's open and inactive.
Select Accounting Cycle from the Chart of Accounts menu, and the Accounting Cycle window opens.
Click the Cycle Name link, or check the box for the accounting cycle, and click Edit. The Accounting Cycle Detail window opens with the Accounting Periods tab displayed.
Check the box(es) for the periods you want to edit, and click Edit or click Edit All. The Accounting Periods Detail window opens.
Change the fields as needed, and click Save or Save and Next.
Return to Accounting Cycle Overview