How do I retrieve lost calendar dates on my device?
I lost all my calendar dates how do I retrieve my calendar?
[Re-Titled by Moderator]
Original Title: Calendar
iPhone 16 Pro Max, iOS 18
Calendars are hosted on email servers, so if you deleted an email account that had calendars syncing to it (or the password changed, and was not updated on your iPhone) you would lose all data.
If your calendar is specifically an iCloud account you can recover by restoring previous automatic backups of it→iCloud: Restore contacts, calendars, and more in iCloud Settings