Sync your Apple device
CalDAV is an internet standard that lets you sync calendars with your IOS devices and you can use it to sync your Google Calendar to your Apple device (including iPhone, iPad, and iPod touch) so you’ll always have your schedule at your fingertips.
Syncing via CalDAV is only available for Apple devices running software version 3.0 or above.
Check the software version on your device
To sync with your device, follow these steps:
Open the Settings application on your device's home screen.
Open Mail, Contacts, Calendars.
Select Add Account...
Enter your account information:
In the Name field, enter your name as you'd like it to appear to others.
In the Address field, enter your full Google Account or Google Apps email address.
In the Password field, enter your Google Account or Google Apps password.
In the Description field, enter a description of the calendar (e.g. Personal Calendar).
Select Next at the top of your screen.
Turn on the Calendars option is turned on.
After you've completed setup, open the Calendar app on your device and syncing will automatically begin.
Sync Multiple Calendars
By default only your primary calendar will be synced to your device. You can sync additional calendars by visiting the following page from any web browser:
(Google Apps users can go to https://www.google.com/calendar/hosted/your_domain/iphoneselect, replacing 'your_domain' with your actual domain name.)
Select the calendars you'd like to sync, then click Save. The selected calendars will display on