I just found this new updated feature in setting up my fall courses, and it's about to be a gigantic headache for me.
I manage multiple sections of a lab course, where the sections are all in the same Canvas shell in order to make sure all of the information is the same across all lab sections. However, each section has different due dates for assignments based on when the class meets. In the old format, I could make an Excel spreadsheet to update the dates and times for each section, format the date and time in Excel to match the format on Canvas, and then just paste the due date in.
Now, there are two separate boxes to enter into, one for date and one for time. My sort of quick work-around is now useless, and I'm back to manually entering every single value for every single assignment for 6 sections.
It's a little thing, but Canvas is already hard enough to deal with when I've got multiple sections, and this update just makes it harder.