Google Classroom Update, May 3 2016
Yesterday, Classroom made another great update. When creating an assignment, you can now schedule when to post it. Before, you either had to post it immediately or save it as a draft. Then, you would have to come back to the draft and post it when you were ready. Now - if you want your students to be able to see an assignment on Friday at 8 a.m., you can schedule it!
Simply create an assignment, and in the drop down menu next to the word "assign", you will now see the option to schedule.
Next, select a date and time that you want the assignment to post, and click schedule. That's all you have to do, and your assignment will post automatically at the selected day and time.