To enable students to upload assignments the dates must be valid and current. To change the date of an Assignment activity do the following:
- Login to Online Moodle and go to your course
- Turn editing on
- Go to the Assignment activity you want to update
- Click Edit > Edit Settings to go to the activity settings
- Scroll down to the Availability section and adjust the date/time as needed
- Scroll to the bottom of the page and click the 'Save and display' button