When you are unable to power on your tablet, there is another way to perform a factory data reset by using hardware keys. Press the Volume up key and the power key at same time until the screen lights up.
11.4Accounts
Use the settings to add, remove, and manage your Email and other supported accounts. You can also use these settings to control how and whether all applications send, receive, and synchronize data on their own schedules, and whether all applications can synchronize user data automatically.
11.5System
11.5.1Date & time
Use Date & Time settings to customize your preferences for how date and time are displayed.
Automatic date & time
Touch to select Use network/GPS provided time or Off.
Mark the checkbox to use network provided time or use GPS provided time.
Automatic time zone
Mark the checkbox to use
Set date
Touch to open a dialog where you can manually set the tablet’s date.
Set time
Touch to open a dialog where you can manually set the tablet’s time.
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