Calendar doesn't sync between tablet and smartphone

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http://androidforums.com – Hi, My calendar on my Samsung galaxy s3 doesn't sync with my acer iconia a500. I have checked every setting and it just won't work. On my s3 I use s planner, which is also sync with Google calendar (works flawless). On my iconia a500 I use Google calendar, but my appointments from the s3 won't show up. Both devices are synced with the same Gmail. Any help is welcome. Thanks (General)