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Does your phone has a SIM card?
just wondering, how often and why do you restart the phone often?
I have the Dual SIM Version since a few month and updated from 6.0 to 7.0
since then occasionally after restart, the phone has this date problem too - usually it goes away after a few minutes or after a new restart - paid only attention to that, because whatsapp was telling me, that the phones time and date is to far behind from the last message, and therefore whatsapp cannot start correctly