IPhone and Exchange: Wrong date, time or time zone on your iPhone - User documentation

After the time zone change in turkey we had some users complaining about the wrong time zone on their Apple IPhone. See Microsoft Blog. 

Wrong date, time or time zone on your iPhone

If you see the wrong date, time, or time zone, or can't automatically switch to daylight savings time on your iOS device, learn what to do.

Check your settings of your mailbox, your Outlook and your iOS device

1. Change the time zone and language to the correct setting in Outlook Web App. To do this, follow these steps.

• Sign in to Outlook Web App (https://yourinteralexchangedomain/owa/), click Settings, and then click Options.
• In the left navigation pane, click Settings, and then click Regional.
• In the Current time zone box, click the arrow, and then click the correct time zone setting.
• Click Save.

2. Open your Outlook client and check the settings.

FILE-> Options-> Calendar, navigate to Time zones and select the right time zone.

3. Verify your windows computer settings, also take a look at the daylight saving settings:

To Change Time Zone in Settings Windows:

• Click on the Clock in lower right corner of your taskbar and click on Date and Time Settings.
• 

Date & TimeThe settings here are quite simple here as the main overview has it all. You can set the time to adjust automatically or change it manually. Do not forget to select your Time Zone according to the country you live in.

Although it is turned Off in the above image, you may want to turn on Adjust for Daylight Saving Time automatically. In most of Europe, local time is moved forward by 1 hour in Spring and moved backward by 1 hour in Autumn. This happens around March or April and ends in October or November. This practice is called Daylight Saving Time.

Turn off Set Time Automatically and you will be able to change the time and date manually, via the following setting box which opens, as soon as you set it to ‘Off’. However, setting it to set time automatically is always recommended.

4. Update to the latest iOS version (https://support.apple.com/en-us/HT204204)

• Plug your device into power and connect to the Internet with Wi-Fi.
• Tap Settings > General > Software Update.

• Tap Download and Install. If a message asks to temporarily remove apps because iOS needs more space for the update, tap Continue or Cancel. Later, iOS will reinstall apps that it removed. If you tap Cancel, learn what to do next.
• To update now, tap Install.
• If asked, enter your passcode. 

5. Verify your iphone settings (https://support.apple.com/en-us/HT203483):

If you see the wrong date, time, or time zone, or can't automatically switch to daylight savings time on your iOS device, learn what to do.

• Turn on Set Automatically in Settings > General > Date & Time. This automatically sets your date and time based on your time zone.
• Check that your device shows the correct time zone in Settings > General > Date & Time > Time Zone.

If your device still shows an incorrect date, time, or time zone, change each setting instead of using Set Automatically. For example, you might have iOS 9 or earlier and your country or region or government changes the time zone or the observance of Daylight Saving Time (DST). If so, follow these steps:

• Go to Settings > General > Date & Time. 
• Turn off Set Automatically.
• Now you can change the time zone or the date and time
• Tap Time Zone and enter a city with the time zone that you need. (Not sure which city to enter? Use the time-zone map on timeanddate.com to find a city with a time zone that matches your needs.) 
• Or tap the date to change the date and time. 
• The option to turn on Set Automatically might not be available with all carriers or in all countries and regions.
• If the time on your iOS device is wrong after you sync it with your computer, your computer's time might be wrong. Check the time on your computer in System Preferences > Date & Time. You might want to select "Set date and time automatically."

Manual adjustments to time settings to change app behavior (like game timers) isn't recommended.