Struct Not Defined in this Scope?

Projects Programming
2

Welcome.

The problem is that the Arduino IDE parses your sketch, extracts function prototypes, and moves them to the top. Your sketch (roughly) becomes this...

#include <Time.h>

time_t TimeFromPartSpec(PartSpec_t& part);
void SetTimeElementsFromPartSpec(tmElements_t to_elements, PartSpec_t& part);

// Types
typedef struct {
  int current_value[6];
} PartSpec_t;

void setup() {
}

void loop() {
   PartSpec_t part;
   time_t a_time = TimeFromPartSpec(part);
   tmElements_t elements;
   SetTimeElementsFromPartSpec(elements, part);
}

time_t TimeFromPartSpec(PartSpec_t& part) {
  tmElements_t elements;
  SetTimeElementsFromPartSpec(elements, part);
  time_t to_time = makeTime(elements);
  return to_time;
}

void SetTimeElementsFromPartSpec(tmElements_t to_elements, PartSpec_t& part) {
  to_elements.Year = y2kYearToTm(part.current_value[0]);
}

Probably the best solution is to create a second tab (header file) containing the PartSpec_t definition.