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You can change your timezone by following this way:
1- Login to your account.
2- Click on the person looking icon and then click on "Account".
3- In the account page, click on the "Settings" menu and then click on "edit" button.
4- Now you can select your timezone from the dropdown.
After applying these steps, you will see that your submissions' timezone has been changed. But to reflect the new timezone on the google spreadsheet, you should remove your integration and then integrate it again.
Your spreadsheet should show you the true timezone for you.
I hope it helps. If you need further assistance, please let me know.