Sync Calendar entry from iPhone to custom application

Hi, I am new to iPhone development. I made a screen for iPhone which is a calendar. I like to sync my iPhone native calendar entries with my calendar. I dont know how to do that. I need to know what APIs I have to use to sync iPhone calendar to my custom calendar. Thanks

MichaelPhelps,
You should start by resetting your sync history and see if that resolves your issue. To reset sync history:
1. Open iTunes
2. On the Edit menu, click Preferences.
3. Click the Syncing tab.
4. Click the Reset Sync History button.
If that does not help, then you can follow the additional troubleshooting steps in this article:
http://docs.info.apple.com/article.html?artnum=305845
Hope this helps,
Jennifer B.

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