Tap & hold, then navigate to the new day using a second finger and release your event.
Tap and hold to cut your old event and create a new one in different slot. You’ll then get the option to paste in the previous event.
Reschedule an event with ease
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How to Show only the most relevant calendars with Focus Filters
Go to Settings Focus, select "Add filter" and pick your desired calendar for that focus!
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7 iPhone Calendar App Features for Better Event Management
How to use Siri with Calendar, drag-and-drop events, Focus filters, and share calendars on iPhone