Realme
Set the Time Manually auf Realme
Realme UI keeps the clock synced with the mobile network by default. As long as Set automatically is active under Date & time, the system pulls both time and time zone from your carrier and overwrites any manual entry the next time it checks in with the network.
This becomes a problem when the phone has no working SIM connection, when you travel across time zones with mobile data turned off, or when an app needs a specific clock value for testing. In these cases the automatic sync either keeps a wrong time or reverts your manual change after the next network handshake.
Switch to a manual clock
Open Settings ➔ Additional settings ➔ Date & time. Turn off Set automatically. Tap on Time and set the value you need.
Leave automatic time turned on if you regularly cross time zones with active mobile data - the network keeps the clock correct without extra steps. With it off, you have to update the time yourself after flights or daylight saving changes.