Due date on assessments should be iso format

[gmoger-jisc]

Description
Due dates captured against assessments are in unix timestamp format and not converted to ISO 8601 as is standard across xAPI specification. Here is an example:

"object": { "id": "https://DOMAIN/mod/assign/view.php?id=1661199", "definition": { "type": "http://adlnet.gov/expapi/activities/assessment", "name": { "en": "Portfolio Task 1 Submission Upload" }, "extensions": { "http://xapi.jisc.ac.uk/dueDate": "1598223600" } }, "objectType": "Activity" }

Version

• {{master-jisc}} at {{latest}}

[davidpesce]

This appears to only impact the jisc version of the plugin and is due to this here:

moodle-logstore_xapi/src/transformer/utils/get_activity/course_assignment.php

Line 56 in 544715d

$object['definition']['extensions']['http://xapi.jisc.ac.uk/dueDate'] = $course->startdate;

I'm hesitant to change anything with the jisc version as I have no way to test it.