How to make the Arduino and RTC work with the Daylight saving time?

hi,

i using arduino control light conditions project. precision of time critical , use rtc in code.  clock did not switch daylight saving time weekend, computer clock did. re-started computer in case didn't fix issue. , not understand why. shouldn't synchronize computer? read different posts time adjustements don't know why pc , arduino not synchronized. , don't have time make tests after code modifications need work correctly project. in pacific time zone , here code use

#include <wire.h>
#include <chronodot.h>           
#include <time.h>                 
#include <timealarms.h>           

chronodot rtc;

time_t syncprovider()   
{
  return rtc.now().unixtime();
}

void setup()
{
  serial.begin(9600);     
  serial.println("initializing chronodot.");
  wire.begin();
  rtc.begin();
  setsyncprovider(syncprovider);     
 

  if (! rtc.isrunning()) {
  serial.println("rtc not running!");      // following line sets rtc date & time sketch compiled
 
  rtc.adjust(datetime(2014,3,10,5,59,0));
 
  }
 
   if(timestatus()!= timeset)
     serial.println("unable sync rtc");
  else
     serial.println("rtc has set system time");
 
 
   
  alarm.alarmrepeat(6,0,0, morningalarm);     
  alarm.alarmrepeat(18,0,0, eveningalarm);   
}


void  loop(){ 
  digitalclockdisplay();
  alarm.delay(1000);
  int irled = 9;     
  int redled = 10;
  analogwrite(irled, 100);   
  analogwrite(redled, ;
 
}


void morningalarm(){       
 
  int whiteled = 11;         
  analogwrite(whiteled, 150);   
     
  delay(1000);                 

   serial.println("light on");                           
}


void eveningalarm(){       
 
  int whiteled = 11; 
  analogwrite(whiteled, 0);   
       
  delay(1000);

  serial.println("light off");         
}




void digitalclockdisplay()         
{
  datetime = rtc.now();
   
    serial.print(now.year(), dec);
    serial.print('/');
    if(now.month() < 10) serial.print("0");
    serial.print(now.month(), dec);
    serial.print('/');
    if(now.day() < 10) serial.print("0");
    serial.print(now.day(), dec);
    serial.print(' ');
    if(now.hour() < 10) serial.print("0");
    serial.print(now.hour(), dec);
    serial.print(':');
    if(now.minute() < 10) serial.print("0");
    serial.print(now.minute(), dec);
    serial.print(':');
    if(now.second() < 10) serial.print("0");
    serial.print(now.second(), dec);
    serial.println();
   
    delay(5000);
   
}                            // end

i not familiar arduino yet, started use few weeks ago. explaination/suggestion? help,

audrey

don't forget code tags.

what rtc using?  possible doesn't account daylight savings time.  or, since decided annoying it, accounts next weekend.

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