Can't mark a GST/HST return as filed due to error: Filing date should be a valid date and lie between end date and today's date (INDIRECTTAX-19702)

Hi there rickgladwin,

QuickBooks Online is equipped with a robust Sales Tax feature that makes it simple to track the tax that you pay and collect, as well as remit. Being able to mark your return as filed within the QuickBooks Online sales tax module is an important step in the bookkeeping process. When errors occur it can slow down your workflow, taking away from time that could be better spent doing what you love. I want to give you a hand with getting back to business.

The first step in resolving this issue is to double and even triple-check that the dates you've entered are correct. If QuickBooks doesn't like today's date, try using yesterday's date, even if you filed your return through the CRA today. If you're sure that you've got the right dates selected, the next step is to complete some browser and internet troubleshooting steps. These steps help to determine whether the issue you're experiencing is within QuickBooks or if it's as a result of the images and files stored in your browser's cache. I've included some steps below that I'd like you to try. Once complete, attempt to mark your return as filed again:
 

• Clear your browser cache if you're using a browser
• Clear the app cache if you're using the QuickBooks Online app for Windows or Mac
• Try a browser if you're using the app
• Try a private browser window
• Try another browser type
• Make sure you're using a supported browser and system
• Reset your Internet or try on another computer or device

If after trying the steps above, you're still unable to mark your return as filed, I'd like to welcome you to contact our awesome team of support experts outside of the Community. They'll be able to assist you with tools such as screen sharing, that allow them to take a look at what you're seeing to try and get to the bottom of the issue. If necessary, they'll also be able to escalate the issue to our team of engineers for a fix and add your contact details to a list of impacted users. That way you'll be among the first to know when there's a fix. Here are some ways that you can reach out for support: 

Phone: Call us at 1-855-253-1536 from Monday to Friday between the hours of 9 AM and 8 PM EST.
Schedule a Callback or start a Chat: click (?)Help in the upper right > type and enter "Contact support" into the QB Assistant > click Contact Us > explain your situation > click Let's Talk > choose Get a callback or Start a Chat. 
Social Media: Facebook, Twitter, and Instagram.

I'm confident that you'll get to the bottom of this and be back to business in no time. Take care and enjoy the rest of the week!