Nokia C21 user guide
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Date and time
Set date and time
Tap Settings > System > Date & time .
Update the time and date automatically
You can set your phone to update the time, date, and time zone automatically. Automatic update is a network service and may not be available depending on your region or network service provider.
- Tap
Settings >System >Date & time . - Switch
Use network-provided time on. - Switch
Use network-provided time zone on.
Change the clock to the 24-hour format
Tap Settings > System > Date & time , and switch Use 24-hour format on.