DS1307 RTC does not keep the time when arduino is power off.

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hi everyone, using arduino micro ds1307 rtc. rtc work when arduino power on , using example code of softrtc. however, rtc not continue counting time if command out line rtc.begin(datetime(f(__date__), f(__time__))); . date change 2106 year , else. if not command out line, time start time when compile it.

hope can on it. lot.

did have battery connected rtc?


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