Can't Reset Time

A

AC Question

My Samsung Tab 2 has been turned off for months as my son lost the charger we have now found it, the time/date is wrong but when I try to go into settings to change the date/time it comes up with -Android system updating now please try again later with a picture of android robot.
I have tried resetting by pressing the power & volume button at the same time but it still won't work. Aaaaaah please help!!!
 

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