bool summertime (int year, byte month, byte day, byte hour, byte weekday, byte tzHours); when using this library. It appears that there is some change in the use of the type byte. I re-tested with ...

Hi, Mike. What version of the Arduino IDE are you using, and what board are you trying to compile for? Are you using one of the example sketches or did you write your own? Could you confirm that you ...