I'm confused about a recent interface change.
The option to delay an announcement is gone. It seems to have been replaced with "Available from" and "until" forms. These don't seem to work the same: I drafted and saved an announcement on 30 July, and set its "available from" date to 25 August. When I look at Canvas now, it says the announcement was posted on 30 July, which is contrary to how this used to work and contrary to what I expected.
Hence my confusion.
I also don't know whether students actually received any notification of this or not. I can't ask them in person since classes haven't started yet.