Calendar Timezone problem in Sierra

Discussion in 'macOS Sierra (10.12)' started by wowotoe, Sep 22, 2016.

  1. wowotoe macrumors member

    Jun 25, 2007
    Anyone having calendar items in different timezones? I'm currently traveling in Asia so I set my Calendar's timezone as Taipei Standard Time. (One day ahead of PST) After upgraded to Sierra, I can see the event scheduled for Pacific Time shifted to Taipei time. For example, a event scheduled for Friday PST should occurred on Saturday Taipei time. But now happening on Friday Taipei time too.

    The scheduled item are synced with Exchange and looks OK on iOS 10 on my iPhone/iPad, but not Sierra. Also, Calendar still displays the past events in correct dates based on timezone. Only the events after the upgrade are affected.

    I try to reach Apple Discussion website, but it keeps on saying it's down. :(
  2. baryon macrumors 68040


    Oct 3, 2009
    I'm not sure I completely understand your issue, but I've had time zone problems with Calendar in previous versions of OS X and here's what you can try:

    • Go to Calendar > Preferences > Advanced and tick "Turn On Time Zone Support". When this is ON, you'll have a time zone menu in the top right corner of Calendar where you can choose what time zone to view everything as. When you change it, it changes the times of all events accordingly. If you turn this OFF, then it automatically tries to figure out what your time zone is and adjusts previous events to match depending on where you were when you created them. Having this either ON and OFF can cause major problems, I think the way they did this is really stupid. 3pm should just always be 3pm and it shouldn't care about time zones, but whatever.
    • When creating a new event, change its time zone to "Floating". I think you can only do this if Time Zone Support is ON. The "Floating" time zone makes sure that the time you set will always be that time. You can't have events default to Floating, so you have to do this each time.
    • Or, change all your events to the same time zone. Be careful to modify their time to be correct if they shift when you change their time zone. Then in the top right menu, make sure that that time zone you chose is always the one selected regardless of where you are currently. That will prevent times from changing.

    So for example, if you chose GMT as your time zone, then set all your events to be in GMT, then choose your time zone to be GMT at the top right. If you travel to a GMT+1 country, make sure that the time zone in the top right menu remains GMT. Or just use Floating, that works too.
  3. wowotoe thread starter macrumors member

    Jun 25, 2007
    Hi Baryon,

    Thanks for your reply. My timezone support in Calendar is always on as I travel a lot. However, I cannot change the timezone for the events as these are sent by other people to my work's Outlook/Exchange. These events are marked as PST and displayed correctly on my iPhone/iPad, which is in different timezone too. But in Mac Calendar, they are one day ahead.

    I updated my Mac on Wednesday, so the events after Wednesday are displayed incorrectly. But the past events look fine. For example, my vendor setup a recurring event every Friday in PST. But Calendar shifted to Thursday. And if I turn off timezone support in Calendar, it'll even shift to Wednesday.

    I've removed the Exchange account from Calendar and switched to Mac Outlook instead.

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