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#include "apps/sntp/sntp.h"
#include "WiFi.h"
struct tm timeinfo;

const String timeStr[7]= {
  "EST-10EDT-11,M10.5.0/02:00:00,M3.5.0/03:00:00",
  "CET-1CEST-2,M3.5.0/02:00:00,M10.5.0/03:00:00",
  "GMT+0BST-1,M3.5.0/01:00:00,M10.5.0/02:00:00",
  "WET-0WEST-1,M3.5.0/01:00:00,M10.5.0/02:00:00",
  "MSK-3MSD,M3.5.0/2,M10.5.0/3",
  "HAW10",
  "MST7",
};

//TZ strings can be found at http://www.remotemonitoringsystems.ca/time-zone-abbreviations.php

const char wifissid[] = "your-network-ssid";
const char wifipsk[]  = "your-network-psk";

void setup() {
  Serial.begin(115200);
  
  Serial.println( "\n\nSetting TZ environment variable example" ); 
  Serial.println( "\nConnecting WiFi" );
  
  WiFi.begin( wifissid, wifipsk );

  while (WiFi.status() != WL_CONNECTED ) {
    Serial.print(".");
    delay(500);
  }
  Serial.println( "\nGetting NTP time...\n" );

  Serial.println( "Getting time from pool.ntp.org\n\n" );
  configTzTime( "", "pool.ntp.org" );
  
  Serial.println( "Localtime with no TZ set..." );
  getLocalTime( &timeinfo );
  Serial.println( asctime( &timeinfo ) );
  delay( 3000 );  
}

void loop() {
  Serial.println( "Now some random TZ setting examples...\n\n" );
  for ( int count = 0; count < 7; count++)
  {
    setenv( "TZ", timeStr[count].c_str(), 1 );
    getLocalTime( &timeinfo );
    Serial.println( "TZ: " + timeStr[count] );    
    Serial.println( asctime( &timeinfo ) );
    delay(3000);
  }
}