Arduino + RealTimeClock + LED

hai sir,
i am using a 3 led(RED, YELLOW, GREEN), ARDUINO board and REAL TIME CLOCK
i am using the
http://www.dfrobot.com/index.php?route=product/product&filter_name=real%20time%20clock&product_id=511

i want try to make LED blinking according to the time range

i have 3 led:
RED led; it will on only from 1 a.m to 2a.m
YELLOW led; it will on only from 2 a.m to 3a.m
GREEN led; it will on only from 3 a.m to 4a.m

my problem is i dont know how to make the range in the coding..
how to write this range for the command??

i hope u can help me figure this out

i had edit the code from the autofeeder coding..
http://www.robothead2toe.com.my/download/Vol.%2011/Download%20for%20Vol%2011%20Dec11.zip

and this is what i had made..
this coding has working when i running it on arduino.. and i make the led blinking for 5sec.. but how to make it blinking according to the time range??

#include <Wire.h>
#include "RTClib.h"

// Assign LED to digital pin 13
const int  LED = 13; 
const int  LED2= 12;
const int  LED3= 11;

// Flag for entering LED routines
uint8_t flag = 1;   
uint8_t flag2 = 1;
uint8_t flag3 = 1;

// Create RTC object
RTC_DS1307 RTC;

// Set alarm to activate two times a day
byte HOUR1 = 00, MINUTE1 = 21;  
byte HOUR2 = 00, MINUTE2 = 22; 
byte HOUR3 = 00, MINUTE3 = 23; 

void setup ()
{

  pinMode(LED,OUTPUT);    // LED pin as output
  digitalWrite(LED,LOW);  // Turn off LED by default
 
  pinMode(LED2,OUTPUT);    // LED pin as output
  digitalWrite(LED2,LOW);  // Turn off LED by default
 
   pinMode(LED3,OUTPUT);    // LED pin as output
  digitalWrite(LED3,LOW);  // Turn off LED by default


  Serial.begin(57600);    // Initialize serial & set baudrate

  Wire.begin();           // Initialize I2C 2 wires interface
  RTC.begin();            // Initialize DS1307 RTC chip

  if (! RTC.isrunning())  // If RTC is not running, set the time
  {
    Serial.println("RTC is NOT running!");
    // following line sets the RTC to the date & time this sketch was compiled
    RTC.adjust(DateTime(__DATE__, __TIME__));
  }
}


void loop ()
{

 
  // Read current time from RTC chip
  DateTime now = RTC.now();
  // Send current time to serial for debugging
  Serial.print(now.year(),DEC);
  Serial.print('/');
  Serial.print(now.month(),DEC);
  Serial.print('/');
  Serial.print(now.day(),DEC);
  Serial.print(' ');
  Serial.print(now.hour(),DEC);
  Serial.print(':');
  Serial.print(now.minute(),DEC);
  Serial.print(':');
  Serial.print(now.second(),DEC);
  Serial.println();
 
//  led red
  if(((now.hour()==HOUR1)&&(now.minute()==MINUTE1)))
  {
   
      if(flag == 1)
      {
        Serial.print("RED");
        Serial.println();
        digitalWrite(LED,HIGH);
        delay(5000); //delay for 1sec      
        flag = 0;    // clear flag    
        delay(1000);
     }
     else
     {
       digitalWrite(LED,LOW); 
     }
    
    
  }

 
   
 
//  led yellow
   if(((now.hour()==HOUR2)&&(now.minute()==MINUTE2)))
  {
   
      if(flag2 == 1)
      {
        Serial.print("Yellow");
        Serial.println();
        digitalWrite(LED2,HIGH);  
        delay(5000);  //delay for 1sec   
        flag2 = 0;    // clear flag    
        delay(1000);
     }
     else
     {
        digitalWrite(LED2,LOW);
     }
  }
 
 
 
 
// led green 
     if(((now.hour()==HOUR3)&&(now.minute()==MINUTE3)))
  {
   
      if(flag3 == 1)
      {
        Serial.print("GREEN");
        Serial.println();
        digitalWrite(LED3,HIGH);  
        delay(5000);  //delay for 1sec   
        flag3 = 0;    // clear flag    
        delay(1000);
     }
     else
     {
        digitalWrite(LED3,LOW);
     }
  }
   
}
void loop ()
    {
    // Read current time from RTC chip
    DateTime now = RTC.now();

    digitalWrite(LED,now.hour()==1);    //  Red LED is on from 01:00 through 01:59

    digitalWrite(LED2,now.hour()==2);    //  Yellow LED is on from 02:00 though 02:59

    digitalWrite(LED3,now.hour()==3);      // Green LED is on from 03:00 through 03:59
    }