Still haven't figured out how to time the 3 days interval in arduino code, but i remembered that a fellow forum member told me that my rtc can output date as second passed since 1970 or something like this (may be millis and not seconds, can't remember.) But i would need help on how to access that data. I have not managed to learn more than basic time commands so far.
I read more on it and I realised I'm referring to the time_t, now() function, yet this doesn't work with the ds3231 rtc i have connected via I2C. Is there a reason for this to not work on I2C or maybe I don't use the function correctly? Can anyone provide an example on hou to use the now(); command to get valid data?