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Right click on that sync icon and view the last report, if it says something tha is helpful. If re´booting your phone (take battery out for a moment) won't help, you an try to choose "new sync settings" from the sync application that should force slow sync (like th efirst time sync) to your device and maybe it helps.
Easy on 9300 too: Plan a): Calendar -> Shift+Ctrl+D -> Options -> Change the End day to tomorrow Plan b): Open Calendar, press Shift+Ctrl+Chr+k to kill the application and then delete the file (C:\System\Data\Calendar) from the device memory