Sometimes assignments created in Turnitin can present an error that the Turnitin assignment could not be created and that the post date must be after start date.

Turnitin error saying that assignment cannot be created because post date must be after start date.

This error occurs when there is a disconnect between the Canvas due date and the Turnitin due date.
Here are the steps for correcting this issue:

Step 1: Click on 3 dots for that assignment and select Edit.

Step 1 Click on 3 dots and select Edit.

Step 2: On the 'Edit Assignment' screen, click More Options.

Step 2 On the Edit Assignment screen, click More Options.

Step 3: Remove all dates; Due Date, Available from and Until date and click Save.

Step 3 Remove all dates and click Save.

Step 4: The Turnitin assignment will load. Check the Start Date, Due Date and Feedback Release Date.

Step 4 Turnitin screen loads, check the dates.

Step 5: Re-enter the due date on the Canvas page by going back to Edit Assignment screen (Step 1&2) and click Save.

Step 5 Go back to Canvas screen and add Due Date and click Save.