fix event_cases insert will failed issue, this is cause of the wrong time-format.
fix event_cases insert will failed issue, this is cause of the wrong time-format.

Cepave/open-falcon-backend,Cepave/open-falcon-backend,Cepave/open-falcon-backend,Cepave/alarm,masato25/open-falcon-backend,Cepave/alarm,masato25/open-falcon-backend,masato25/open-falcon-backend,Cepave/alarm,Cepave/open-falcon-backend,masato25/open-falcon-backend,Cepave/open-falcon-backend,masato25/open-falcon-backend,masato25/open-falcon-backend,Cepave/alarm,Cepave/open-falcon-backend