How can i change date format in GSTR-1 report. Sheet is protected-with a password

Let me help you change the date format in the GSTR-1 report, @anjumangla. 

We can change the date format in the Account and Settings since the Sheet is password protected. The date format set in QuickBooks flows on your reports and exported excel files. Here's how: 

1. Go to the Gear icon on the top menu.
2. Choose Account and Settings.
3. Go to Advanced.
4. Click on the pencil icon under Other preferences, and select the date format that you want to use.
5. Tap Save under other preferences, then press Done.

I've added the Change company name, address, email address, and privacy settings if you need to modify other information on your account. Here are some articles that will guide you through modifying and memorising reports in QBO: 

• Learn how to get the most out of your financial reports.
• Memorise reports in QuickBooks Online.

You can always go back to this post after performing the steps as I want to make sure this is resolved for you. I can also help you with other report-related concerns in QuickBooks. Have a great day ahead.