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 @theo_dufort , This is not a definitive statement, just a summary of what I've found. The posted_at property is supposed to represent when the grade or feedback becomes available to the student. In my experimentation with the new gradebook and the grade posting policy,  posting grades will set this to the current date and time. This changes even if the grade was already available to the student. For example, consider John, who had turned his work in early and the instructor posted the grade for him. Later, the instructor posts the grades for the entire section that John is in. The posted_at datetime will reflect the time when the entire section had their grades released, even though John had been able to see it earlier. If you have a missing policy, then the posted_at should reflect when the grade was assigned. For example, I had an assignment due at 23:59:59 yesterday and Canvas marked it posted_at 00:00:49 this morning. I had a student submit that same assignment at 22:06:17 yesterday, but the posted_at is 22:17:54. I did not grade it, but that was the time that I left her a submission comment on the assignment. I had another student submit at 10:22:28 yesterday, I left a submission comment at 10:34:08, which is the posted_at timestamp. I graded it at 14:08:51, but the posted_at remained from the earlier submission comment. Looking at another assignment that isn't even published yet. It shows a posted_at date of 22:40:48 on January 14. The course wasn't even published at that time, although it's possible that's when I went through and unpublished the assignment from when I had copied it over from another course. The posted_at wasn't always there. The documentation on it got added about 8 months ago. It's possible that if you had an assignment without a posted_at, the timestamp notes when Canvas added that field to the database and it went through and assigned values for grades that were available. ... View more

 @theo_dufort   Are you talking about Canvas Data or through the API? In Canvas Data, there is a submission_dim.posted_at timestamp that is described as "The date this submission was posted to the student, or null if it has not been posted." If you're using the API, there is a posted_at property of the submission object that functions the same as described in Canvas Data. In my exploration, the posted_at field returns the most recent time that the results were posted, not the earliest. The timestamp gets updated even if the status doesn't change. For example, let's say that John is in section 1. The instructor goes through and manually releases John's score and then later goes through and releases the grades for section 1. John's timestamp will be that for the entire section, not the earlier date when it became available to him individually.  It's been a month or two since I looked at it, so it may have changed. but I haven't seen anything in the documentation that suggests it has. ... View more