Our first company year runs from 13th September 2019 to 30thSeptember 2020, the second year runs from 1st Oct 2020 to 31st March 2021, can i adjust QB to reflect this?

I hope you're having a wonderful day, info1249.

I'm here to walk you through the steps where to adjust the financial reporting year or accounting year. Simply follow these steps:

1. Go to the Gear icon > Account and settings.
2. On the left panel, click the Advanced tab.
3. In the Accounting section, select the month from the First month of fiscal year drop-down menu.
4. Hit Save and then Done.

Please see this sample screenshot for a visual guide:

Once done, try running a report, and you will see the date underneath the report name. Here's a sample screenshot for reference:

To modify the settings, you can read this article: Edit company settings in QuickBooks Online.

Happy to help if you have other questions or concerns with your QuickBooks Online account. Stay awesome!