I am trying to save an invoice it is telling me that a date is wrong i have been through the invoice and there is nothing wrong with the dates

Hi there, sjjgtpt.

It's possible that there's a browser issue that's causing the error when saving the invoice. I'll provide some quick and easy steps on how to check if that's the case. 

You can start the troubleshooting by logging in to your account using an incognito or private browsing session. Use these keyboard shortcuts to open an incognito session:

• Ctrl + Shift + N  for Google Chrome
• Ctrl + Shift + P  for Firefox
• Control + Option +P if you're using Safari

Then, log back in to your account and create an invoice if that will post successfully. Once done, make sure to go back to the regular browsing session and delete the stored cache and cookies if everything is already working fine. Here's a quick guide for more details: Clear cache and cookies to fix issues when using QuickBooks Online.

Please keep me posted if you need anything else. We're always here to help.