Lenovo — Lenovo a7000 with wrong time showing

Dear lenovo team,
This is an pecular problem i am facing.
Even on google i didn't see another facing this wrong time problem suddenly for some period.
For seeing time i have installed external app. But lenovo's time seems to be bit slower than the actual time suddenly for some period.
Is there any solution to this problem.
Due to wrong time showing i couldn't even set alarm on it.
I have attached a screenshot between lenovo's time and external app time.