// RTC demo for ESP32, that includes TZ and DST adjustments
// Get the POSIX style TZ format string from  https://github.com/nayarsystems/posix_tz_db/blob/master/zones.csv
// Created by Hardy Maxa
// Complete project details at: https://RandomNerdTutorials.com/esp32-ntp-timezones-daylight-saving/

#include <WiFi.h>
#include "time.h"

const char * ssid="Wokwi-GUEST";
const char * wifipw="";

void initTime(){
  struct tm timeinfo;

  Serial.println("Setting up time");
  configTime(0, 0, "pool.ntp.org");    // First connect to NTP server, with 0 TZ offset

  if(!getLocalTime(&timeinfo)){
    Serial.println("  Failed to obtain time");
    return;
  }
  Serial.println("  Got the time from NTP");
  setenv("TZ","EET-2EEST,M3.5.0/3,M10.5.0/4",1);  //  Now adjust the TZ.  Clock settings are adjusted to show the new local time
  tzset();
}

void printLocalTime(){
  struct tm timeinfo;
  if(!getLocalTime(&timeinfo)){
    Serial.println("Failed to obtain time 1");
    return;
  }

Serial.println(String(timeinfo.tm_mday)+"/"+String(timeinfo.tm_mon+1)+"/"+String(timeinfo.tm_year-123));

Serial.println(String(timeinfo.tm_hour)+":"+String(timeinfo.tm_min)+":"+String(timeinfo.tm_sec));

}

void  startWifi(){
  WiFi.begin(ssid, wifipw);
  Serial.println("Connecting Wifi");
  while (WiFi.status() != WL_CONNECTED) {
    Serial.print(".");
    delay(500);
  }
  Serial.print("Wifi RSSI=");
  Serial.println(WiFi.RSSI());
}

void setup(){
  Serial.begin(115200);
  Serial.setDebugOutput(true);
  startWifi();
  initTime();
  printLocalTime();
}

void loop() {
  int i;
  
  // put your main code here, to run repeatedly:
  Serial.println("Lets show the time for a bit.  ");
  for(i=0; i<10; i++){
    delay(1000);
    printLocalTime();
  }
  Serial.println();

}