Issue
Forms labeling - The date selectors in Moodle forms is a fieldset without a legend to tell the user what the field set is for. Further more the label on the right of the date field points to no input, there is no for attribute. This is assumed to be so because there are labels in the field set for each select drop down.

Standard Level
WCAG 2 1.1.1 (A) http://www.w3.org/TR/UNDERSTANDING-WCAG20/text-equiv-all.html

Impact
Critical

Example Link
http://demo.moodle.net/course/modedit.php?add=assign&type=&course=625&section=1&return=0&sr=0

Test Steps

1. login as teacher
2. Navigate to the CF101 course
3. Create and assignment
4. View the source for the allow submissions from date selector.