Timezone Write Rules
/*H********************************************************************
* Arduino Timezone Library Copyright (C) 2018 by Jack Christensen and
licensed under GNU GPL v3.0, https://www.gnu.org/licenses/gpl.html
Arduino Timezone Library example sketch.
Write TimeChangeRules to EEPROM.
Jack Christensen Mar 2012
**********************************************************************/
#include <Timezone.h>   // https://github.com/JChristensen/Timezone

//************************* DEFINES ************************************

//************************* PROTOTYPES ************************************

//************************* VARIABLES ************************************
// US Eastern Time Zone (New York, Detroit)
TimeChangeRule usEdt = {"EDT", Second, Sun, Mar, 2, -240};    // UTC - 4 hours
TimeChangeRule usEst = {"EST", First, Sun, Nov, 2, -300};     // UTC - 5 hours
Timezone usEastern(usEdt, usEst);

/*F********************************************************************
*
**********************************************************************/
void 
setup()
{
    pinMode( 13, OUTPUT );
    usEastern.writeRules( 100 );    // write rules to EEPROM address 100
}
/*F********************************************************************
*
**********************************************************************/
void 
loop()
{
    // fast blink to indicate EEPROM write is complete
    digitalWrite( 13, HIGH );
    delay( 100 );
    digitalWrite( 13, LOW);
    delay( 100 );
}