I don’t believe you’ve ever been able to copy a schedule between campaigns. Online you can copy/paste campaigns, ad groups, ads, and keywords… that’s it.
In Editor you can paste those items plus any targeting items.
But ad schedules are part of campaign settings. There’s a separate ad schedule tool for that. Unfortunately, I think you’re stuck manually recreating the schedule.
The alternative is to copy the campaign or campaign shell (I think the schedule will be copied in the shell) to a new campaign and then make your other edits there.