Check the time zone and the date & time in the Settings app (or).
In the section Date & Time , make sure that:
- the time zone corresponds to your location
- Automatic date & time is not set according to network and is Off so you can set the time manually
- the Use 24-hour format box is checked
For a device connected to WiFi or 3G/4G, it is recommended to check the Automatic date & time box so that the time & date is set according to the mobile network.