TimeZoneRTC

// Date and time functions using a DS3231 RTC connected via I2C and Wire lib
#include <Wire.h>
#include "RTClib.h"

RTC_DS3231 rtc;

char daysOfTheWeek[7][12] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};

void setup () {

#ifndef ESP8266
  while (!Serial); // for Leonardo/Micro/Zero
#endif

  Serial.begin(9600);

  //delay(3000); // wait for console opening

  if (! rtc.begin()) {
    Serial.println("Couldn't find RTC");
    while (1);
  }

    DateTime compile = DateTime(F(__DATE__), F(__TIME__));
    DateTime set (compile + TimeSpan(0,0,0,6) - TimeSpan(0,2,0,0)); //+6 seconds minus 2 hours (GMT)
    rtc.adjust(set);

  if (rtc.lostPower()) {
    Serial.println("RTC lost power, lets set the time!");
    // following line sets the RTC to the date & time this sketch was compiled
    //rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
    DateTime compile = DateTime(F(__DATE__), F(__TIME__));
    
    //DateTime toGMT = TimeSpan(0,2,0,0);
    //DateTime fix = TimeSpan(0,0,0,7);
    
    DateTime set (compile + TimeSpan(0,0,0,6) - TimeSpan(0,2,0,0)); //+7 seconds minus 2 hours (GMT)
    rtc.adjust(set);
    //Serial.print(future.second(), DEC);

    // This line sets the RTC with an explicit date & time, for example to set
    // January 21, 2014 at 3am you would call:
    // rtc.adjust(DateTime(2017, 9, 16, 17, 42, 0));
  }
}

void loop () {
    DateTime now = rtc.now();
    
    Serial.print(now.year(), DEC);
    Serial.print('/');
    Serial.print(now.month(), DEC);
    Serial.print('/');
    Serial.print(now.day(), DEC);
    Serial.print(" (");
    Serial.print(daysOfTheWeek[now.dayOfTheWeek()]);
    Serial.print(") ");
    Serial.print(now.hour(), DEC);
    Serial.print(':');
    Serial.print(now.minute(), DEC);
    Serial.print(':');
    Serial.print(now.second(), DEC);
    Serial.println();
    
    Serial.print("Since midnight 1/1/1970 = ");
    Serial.print(now.unixtime());
    Serial.print(" s = ");
    Serial.print(now.unixtime() / 86400L);
    Serial.println("d");
    
    // calculate a date which is 7 days and 30 seconds into the future
    //DateTime future (now + TimeSpan(7,12,30,6));
    
    Serial.println();
    delay(3000);
}