Thank you for your answers . I finally opted for an rtc card based on 1307. But if I type sudo hwclock -r the clock is on time but not the system time even after reboot. . If I type sudo hwclock -s the system is set to the correct time but after a reboot I still have the old system time and if I type sudo hwclock -r the time and date are correct. How to have the right time when starting the raspberry? I'm on Ubuntu mate 16.04. Thanks in advance friends

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