Why are quiz attempts marked late even though there is an Until Date/Time and Due Date established?

[cvera1]

Today an instructor informed us that some of her student submissions for a quiz were being marked late even though she has established an until date and a due date that are the same (match e.g. March 1 at 11:50am) The quiz is also timed at 20 minutes and it allows for unlimited attempts. There are also multiple dates established and this student fell into the 11:50 due date/until date/time. One student made three attempts, two were within the 11:50 due date and until date time frame but the third and last attempt shows having submitted at 12:03pm. I wonder how this is possible since there is an until date established 11:50am so wouldn't the system have submitted this/cut student's attempt off at this time and no late marks would have been possible? Is having a timer in combination with the until date an issue? Student did start the third attempt a little later and would have not been granted the full 20 minutes if the until date/time should have auto submitted. 

In addition, we noticed that when we go to see the students submission information from the Gradebook column by clicking on the comment/bubble icon in the student's cell, the window displays all three attempts as "late" even though only one was submitted past the due date and time. In SpeedGrader the last attempt was marked late because it was technically late and the other two were not. The gradebook cell is also shaded pink. 

[Chris_Hofer]

Hello  @cvera1 ...

I've been reviewing older questions here in the Canvas Community, and I came across your question.  I'm sorry to see that your question has been sitting unanswered since you first posted on March 6, 2019.  It appears that you may have stumped Community members with your question.  I wanted to check in with you to see if you've had any luck on your own finding a solution?  If so, would you be willing to share that with us back here in this topic?  Or, if you are still looking for some help from Community members, please let us know that as well so that someone might be able to help you out.  For the time being, I am going to mark your question as "Assumed Answered"...not because we've necessarily found an answer for you...but more because we've not heard back from you and because there hasn't been any new activity in this topic for over six months.  However, that won't prevent you or others from posting additional questions and/or comments below that are related to this topic.  I hope that's alright with you, Cryssel.  Looking forward to hearing back from you soon.

[cvera1]

Hi Chris, I haven't found a solution to this issue but it's ok to leave it as assumed answered. 

Warm regards, 

Cryssel

[mjungbluth]

I just noticed I think this is still an issue.
I allow two attempts at quizzes, with it accepting the best score. 
My student submitted their first quiz attempt before the deadline with a relatively good score, and then they tried a second attempt well after the deadline. With the late penalty I apply to all late assignments, the second attempt score was worse than the first, but bCourses is treating the first submission like it was also late by deducting points even though it shouldn't in my mind.  I haven't yet figured out how to resolve this without checking the math and excluding any late attempts that scored lower than the first.