Nokia T21 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 tablet 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 on
Set time automatically . - Switch on
Use location to set time zone .
Change the clock to the 24-hour format
Tap Settings > System > Date & time , and switch Use 24-hour format on.