/*
    https://forum.arduino.cc/t/gps-utc-calender-problem-in-time-zone-0/1230832/8
    2024-03-03 by noiasca
    code in thread
*/


#include <time.h> // comes with Arduino Core see https://cplusplus.com/reference/ctime/

void test() {
  // get your time elements in UTC:
  int year = 2024;
  int month = 3;
  int day = 3;
  int hour = 22;
  int minute = 20;
  int second = 30;

  // generate a struct tm with the given data:
  tm timeinfo = {0};
  timeinfo.tm_year = year - 1900;
  timeinfo.tm_mon = month - 1;
  timeinfo.tm_mday = day;
  timeinfo.tm_hour = hour;
  timeinfo.tm_min = minute;
  timeinfo.tm_sec = second;

  time_t utc = mktime(&timeinfo);  // time_t UTC (epoche)
  uint16_t offset = 2 * 60 * 60UL; // difference in seconds
  time_t local = utc + offset;     // time_t in local time (epoche)
  tm * localinfo;                  // struct tm for local time
  localinfo = localtime (&local);  // update local timeinfo based on local 

  char buffer[42] {0};              // a buffer large enough to hold your output
  strftime (buffer, sizeof(buffer), "%Y-%m-%d %H:%M:%S", &timeinfo);
  //Serial.println(utc);
  Serial.println(buffer);

  strftime (buffer, sizeof(buffer), "%Y-%m-%d %H:%M:%S", localinfo);  // for different formats see https://cplusplus.com/reference/ctime/strftime/
  //Serial.println(local);
  Serial.println(buffer);
}

void setup() {
  Serial.begin(115200);
  Serial.println("time.h");
  test();
}

void loop() {
  // put your main code here, to run repeatedly:

}