Missing calendar entries on my iphone?

I have an iPhone running IOS 6.0.1. I have been using Yahoo Calendar for 6 years and never had a problem. Recently I noticed there are missing calendar entries. About 25% are missing. I have deleted the calendar from the iphone and added it back. No luck. I also tried synching only the last few months rather than All EVENTS but this did not fix it either. When I logon to yahoo calendar from my laptop, all the entries are there. I also tried terminating the application and restarting it. It is not synched using a CALDAV address - I just gave it my userid and password. Any ideas?

If you created a backup of your iPhone during the update process, you can recover your missing calendar entries. If you did not create a new backup, you can't recover the deleted calendar entries. Click the "Summary" tab in iTunes and click the "Restore" button. Select the backup created during the update and click the "Confirm" button. Your iPhone will restore your calendar entries. The restore process will also remove the update from your IPhone, so you will need to update your iPhone a second time after restoring your calendar events.

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