Analysis：
It may be caused by third-party software, or the time algorithm in the system is damaged or affected, which is generally solved by updating the system and clearing data.
Solutions:
1. Settings--Apps--Manage apps--Clock--Clear data;
2. Settings--Additional settings--Date and time--close Use network-provided time;
3. Update to the latest system;
4. Stop and uninstall the optimized security software installed in the mobile phone;
5. Reset the system after effectively backing up the data (this operation will clear all data);
6. Apply for after-sale inspection service.