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Time Zones

The world is divided into different time zones (please see Wikipedia for further details). Some/most time zones use daylight savings time but not all. Modern calendar systems like Google Calendar save events with a globally unique time, they use UTC (GMT+0 without daylight savings time) times for all events. Based on this UTC time and the currently used time zone of the user, they calculate the correct time for the user’s time zone.

The following example shows how an event entered for 10am in New York for different months is saved in UTC time and how it is displayed in other time zones like Berlin or Reykjavik:

So when you travel into another time zone and change your phone’s time zone, the your events will be displayed with this new time zone so the appointment times will change. If you don’t want this, you can simply use a fixed time zone for your calendar: Just turn “Settings”, “Display and Use”, “General”, “Ignore iPhone/iPod/iPad time zone” on. Then your events will be displayed with the same times regardless which time zone your phone uses. CalenGoo will use the time zone of your first Google calendar as your home time zone. If this isn’t the correct time zone or if you don’t sync with Google Calendar, you can set the time zone manually under "Settings", "Display and Use", "Expert", "General", "Use fixed time zone".

Changing time zone settings

In CalenGoo you can see your current time zone configuration under “Settings”, “Time zones”:

CalenGoo's overview of your Google Calendar time zones.

It shows the time zone of your iPhone/iPad/iPod touch at the top and below the time zones of your different Google calendars. Each of your calendars can have a different time zone.

These are the different time zone settings you can configure:

The time zone of your iPhone/iPad/iPod touch

You can change this time zone in the “Settings” app under “General”, “Date & Time”, “Time Zone”. Or if it is set to “Automatic”, the time zone is retrieved from your provider’s network.

You can set the time zone manually.Or you can use the time zone that your mobile phone network provides.

The time zone CalenGoo uses

CalenGoo can either use your phone’s time zone (see above) or the time zone of your first Google calendar. If it uses your phone’s time zone and you travel into a different time zone, all your appointments will be shifted according to the new time zone. This can be useful e.g. if your appointment is a phone call with someone at home, because then the correct time will be displayed when you should make the call.

If you don’t want this, you can use the other option, to always use the time zone of your first Google calendar. Then your appointments will have the same times as on the Google Calendar website. They won’t shift if you travel into another time zone. To use the time zone of your first Google Calendar, just turn “Settings”, “Display and Use”, “General”, “Ignore iPhone time zone” on.

CalenGoo's settings to ignore the device's time zone.
If your first calendar does not have the correct time zone that you would like to use, you can also choose a time zone manually under “Settings”, “Display and Use”, “Expert”, “General”, “Use fixed time zone”.

If you turned “Ignore iPhone time zone” on, you can additionally specify which time the red line that indicates the current time in the day view should display:

It can either take your current time zone into account and display the time of your HOME time zone (the one your Google calendar uses) (“Red line ignores time zone” OFF) or it can simply display the current time of your phone (“Red line ignores time zone” ON):

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The time zones of your calendars

Each calendar in Google Calendar has its own time zone. You can configure them in Google Calendar by clicking the names of your calendars in the calendars tab:

Calendar listCalendar settings
After you have changed these time zones in your Google Calendar, please tap “Settings”, “Reset calendars” in CalenGoo to erase all events and calendars in CalenGoo and re-download everything from Google using the new time zone settings.