How do I delete and re-install Mac OS Calendar

I am running 10.15.5 on an iMac. For some reason, I no longer can open Calendar. When I try, it takes more than ten minutes of "updating calendars" before it quits. Is there a way to delete just Calendar and re-install it? I have deleted and re-installed Mojave, but same problem. Calendar works fine on my iOS devices and in iCloud. Or are there some files/libraries that I need to delete that will fix this?

Posted on May 25, 2019 7:18 AM

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Posted on Jul 4, 2019 8:49 AM

Ferd and Lanny, I went into my Library, opened the Calendar folder, and deleted everything. It worked perfectly. The app opened quickly, and I watched the calendars populate first with standard holidays that Apple supplies, and then with my own entries. Keep in mind that my iOS calendars on my iPhone and iPad always worked properly. Thanks for your advice throughout all of this.


My replies to you have been sporadic due to travel and family emergencies. Today was the first time that I could sit down and try a few things.



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Jul 4, 2019 8:49 AM in response to Ferd II

Ferd and Lanny, I went into my Library, opened the Calendar folder, and deleted everything. It worked perfectly. The app opened quickly, and I watched the calendars populate first with standard holidays that Apple supplies, and then with my own entries. Keep in mind that my iOS calendars on my iPhone and iPad always worked properly. Thanks for your advice throughout all of this.


My replies to you have been sporadic due to travel and family emergencies. Today was the first time that I could sit down and try a few things.



May 25, 2019 7:23 AM in response to bobkow

Try these steps...


Backup your iCloud Calendars.


Then paste this text ~/Library into the Finder Menu>Go>Go to Folder...window and select "Go." This will open the Users Library Folder.


Open the Calendars Folder which is in that Library Folder, and move any any files with "Cache" listed in the name field to your Desktop.


Next open the Preferences Folder in that same Library Folder and move the com.apple.iCal.plist file to the Desktop.


Log out/in or restart and open Calendar.

May 25, 2019 10:34 AM in response to bobkow

Get help using iCloud Contacts, Calendars, or Reminders - Apple Support offers additional troubleshooting advice.


When did you start having problems?


Fantastical is a factor that I'm not familiar with in regard to troubleshooting Calendar, perhaps there was a conflict?


Back to your original question...there would not be a way to delete/reinstall just Calendar.


Can you get Calendar to open using "Safe Mode?"


Jun 25, 2019 12:08 PM in response to bobkow

bobkow wrote:

I did create a new user and opened up Calendar and I got a new, blank Calendar filled in with standard holidays. So the app works. But not the app that is in my User file.

I want to try this; delete everything in the calendar folder and library and then create a completely new calendar file from scratch. Then I would import my calendars from iOS.

Considering what you have already tried, I am hesitant to provide additional recommendations. Since I know nothing about how Fantastical may have affected your installation, perhaps Fantastical Support may provide you with some suggestions to ensure that it was completely and properly uninstalled.


It might also be helpful to review the Calendars Folder structure in the new user account, and compare it to the structure in your active user account. Then delete only those items which differ. It sounds like Calendars still refuses to open, but if opened make sure that "Enabled" is deselected in Calendars>Preferences...>Accounts>iCloud.


If you decide to "delete everything" in the Calendars Folder in your Home Folder, make sure that you have a bootable backup of your computer. I have not attempted that, but after deletion I would consider disabling iCloud Calendars in System Preferences>Internet Accounts>iCloud>Calendars, and using the macOS Mojave 10.14.5 Combo Update.


Since I have not tried any of these procedures, my post should not be construed as describing what you should actually do. My comments are only presented for your consideration.

Jun 25, 2019 5:26 AM in response to Ferd II

Ferd, I have tried quite a few things at the suggestion of Apple, but nothing has worked. BTW, they also offered me your suggestion, but it was a last resort.


I did create a new user and opened up Calendar and I got a new, blank Calendar filled in with standard holidays. So the app works. But not the app that is in my User file.


I want to try this; delete everything in the calendar folder and library and then create a completely new calendar file from scratch. Then I would import my calendars from iOS.


There is something that is missing, something that prevents the Calendar app from finding my files and info.


Thanks for your help and I welcome any other ideas or input that you have.

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How do I delete and re-install Mac OS Calendar

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