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iPhone calendar entries not synced with MacBook calendar

I use my iPhone 4S calendar as my primary calendar for entering or modifying events for the simple reason that it's with me most, if not all the time.


But after upgrading my MacBook Air to Mountain Lion last week, calendar entries entered or modified on my iPhone no longer synchronize with the calendar on my MacBook Air. As such, I have to manually make the entries or modifications on my MacBook Air so that the calendar will be updated when I synchronize it with my iPad. Am not using iCloud, so the calendar on my MacBook is a local calendar (On My Mac).


Any thoughts on why this is happening and what can I do to fix this?

MacBook Air, OS X Mountain Lion

Posted on Aug 3, 2012 9:32 PM

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Posted on Aug 7, 2012 1:28 PM

Have thrown away a few hours on this identical problem today. Timing coincides with mountain lion upgrade exactly. have noticed contacts have no issues. have removed all calendars, brought them back...nothing. i changed the name of the calendar i was trying to sync (changed it on the iphone via settings). this change did change the calendar name in the iTunes software (where you indicate which calendars you want to sync with) but not Calendar software itself. So it is not a 'checkbox' issue (picking the wrong calendar to sync) nor is it an iCloud issue (as i'm only syncing with the local macbook air).


Not being able to use my calendar is a major issue.

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Question marked as Best reply

Aug 7, 2012 1:28 PM in response to bugoyboy

Have thrown away a few hours on this identical problem today. Timing coincides with mountain lion upgrade exactly. have noticed contacts have no issues. have removed all calendars, brought them back...nothing. i changed the name of the calendar i was trying to sync (changed it on the iphone via settings). this change did change the calendar name in the iTunes software (where you indicate which calendars you want to sync with) but not Calendar software itself. So it is not a 'checkbox' issue (picking the wrong calendar to sync) nor is it an iCloud issue (as i'm only syncing with the local macbook air).


Not being able to use my calendar is a major issue.

Aug 27, 2012 4:10 PM in response to bugoyboy

I have noticed a problem recently, although I can't absolutely be sure it's related to Mountain Lion on the computer. Perhaps iCloud (which I set up, but am not really using yet).


My specific issue is that if I go into Calendar (formerly iCal) on the mac, and edit an already existing calendar event -- change the time, or move it to another day -- the change doesn't always sync through to the iphone properly.


Example: I had a recurring weekly event for 7:pm on a specific day of the week. The start time got pushed back to 7:30. I changed it on the mac, and sync'd to the phone. However, the change did not get applied to the iphone calendar. If I edit it on the iphone itself, it will sync back the other way correctly.


Same sort of problem occurs if I move an event from one day to another on the mac. I will wind up with it showing up on BOTH days on the iphone. If I delete an item, same thing.


It acts like the iphone versions of calendar entries are write-protected in a way. If I edit them on the phone, the changes stick and sync properly to the mac. If I try to do it the other way around, they do not.

Aug 28, 2012 9:56 PM in response to ckuan

Sounds like I'm doomed then for now. I have an iphone 3, and I can't even install the version of iOS that supports iCloud on that phone. And I'm in a contract, and can't upgrade for several more months.


This is broken. It sounds like I have to reinstall an older version of OS X on my mac to get my calendar to work again like it did before the mountain lion upgrade.

Oct 6, 2012 12:57 PM in response to chrisfromgastonia

As stated, I am using OS/X 10.6.8 which to my knowledge does not have or support iCloud. 10.7.4 is required. I am not using iCloud on any devices. I never used to have to do so in order to synchronize my calendars. I checked my iPhone Settings and iCloud is off. I do not want to upgrade my iMac because newer versions of the OS no longer support OS/9 and I still use some apps in compatibility mode.

Nov 28, 2012 3:24 PM in response to ckuan

I think it depends on the amount of items, I have exceeded it once so I had to delete some to go below 25k entries. iCloud duplicates items on iphone while I don't see them on my mac so I can't use it. But anyway, the sync should work even if I do not use iCloud, that's the subject of this discussion so I'd be glad to know if anyone had solved it and how.

iPhone calendar entries not synced with MacBook calendar

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