Is your Android phone constantly dropping 1 hour or setting itself to another incorrect time? You may be missing alarms because of the wrong time. There are a few things you can try to get it working again.
Samsung Phones: How to Fix the Problem of Time Not Displaying Correctly
The most likely reason is that the time zone is configured incorrectly, either manually or incorrectly. When the wrong time zone is set on your phone, it will display the wrong time even if the automatic time switch is on and working.
There is no single reason why the time on your phone is wrong. There are several things you can try to fix the problem.
Reboot your Android. This is often the solution to these kinds of oddities. Rebooting is so easy and usually fixes these kinds of problems that it is the most obvious first step to take.