When syncing iPhone calendar with iTunes some of the dates are incorrectly put onto the next day. It appears to only be ones that are full day events. I have checked the time zone & dates/times are correct.

When syncing iPhone calendar with iTunes some of the dates are incorrectly put onto the next day on the computer. It appears to only be ones that are full day events. I have checked the time zone & dates/times are correct.

When trying to fix this problem I now find that my calendar has multiple entries for the same event on iphone. Tried the 'replace' option on itunes but it didn't work. Some of the events transferred to the iphone do not come up with an edit option so I can't even delete them manually. Help.