Transferring iCloud calendar
how to copy icloud calender to another account?
I have another iCloud account due to my regular one got compromised. How to transfer the old iCloud calendar to my new account?
MacBook Air 13″, macOS 26.6
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You could try to export your calendars on your Mac (File > Export in the menu bar; you'll need to export each calendar individually) and import them (File > Import) while logged to your new Apple Account.
For more informations: Import or export calendars on Mac - Apple Support.