Remove Multiple/Duplicate Calendar Entries on Android

I am using ZTE Android 2.3 and one problem with my Calendar is that it has duplicate calendar entries, some items are even repeated 4 to 5 times, and this makes my Calendar hard to use. I found a way to solve this:

Settings > Applications > Manage applications > All > Calendar storage > Clear data... Then please try syncing again.

This works perfect for me!

[Update on 2014-03-05] For latest Android versions, for example 4.4, the path is a little different.
Settings > Apps > All > Calendar > Clear data..
But sorry I didn't have the problem in Android 4.4, I didn't test it. If you met the problem, you can try the path above.

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