IOS – iPhone Today View for Apple calendar Whats Up Next showing wrong time

Each of your devices has a timezone setting, which you probably already set correctly.

What you probably didn't know is that iCloud.com has its own timezone setting. To access it, login to icloud.com, then click on your name in the upper right corner. Once set, you should see everything ok.

The “time zone support” setting you disabled has to do with creating events associated with a timezone, and is usually better left off.

NOTE: Once you change this you will have to logout and then login again for the changes to take effect.

If you have a number of events you want to enter and you have their times in another zone, it's very handy to use Calendar's time zone support.

First, go to Calendar->Preferences, and click Turn on time zone support.

This will enable a dropdown in the titlebar of your Calendar window:

You can then use this menu to change the display of everything in your calendar to a new time zone. Pull it down and select Eastern time (or whatever other time zone or city your event is in), and Calendar will convert all your times to that zone.

At this point, you can start entering events, using the times listed in the program for the event. You will also see a new detail in the event detail popup:

This shows what time zone the event is in.

Once you've entered all the events, turn the time zone back. That will display all your events in your own time zone. If you are syncing with your phone (which knows what time zone it is in) all the events will remind you at the right time.