Web server program.

Using Arduino Programming Questions
#1

Dear all,

I have code as below . I need your help in below coding. I want to keep edit option For setting date and time ,
If edit date and time is ticked . you can make changes over Web
if edit date and time is unchecked . you see current date and time.

#include <SPI.h>
#include <Ethernet.h>
byte mac[] = { 
  0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
IPAddress ip(192,168,1, 178);
EthernetServer server(80);
#include "Wire.h"
#define DS1307_ADDRESS 0x68
byte zero = 0x00; //workaround for issue #527
static int dd;
static int mm;
static int yy;
static int s;
static int h;
static int m;
static int wkDay;
int CENTURY=2000;
int RTC_ERROR_FLAG=0;


void getRTCDateTime(){

  Wire.beginTransmission(DS1307_ADDRESS);
  Wire.write(zero);
  Wire.endTransmission();
  Wire.requestFrom(DS1307_ADDRESS, 7);

  if(RTC_ERROR_FLAG==0)
  {
    //Serial.println("RTC IS ACTIVE :\n");
    s = bcdToDec(Wire.read());
    m = bcdToDec(Wire.read());
    h = bcdToDec(Wire.read() & 0b111111); //24 hour time
    wkDay = bcdToDec(Wire.read()); //0-6 -> sunday - Saturday
    dd = bcdToDec(Wire.read());
    mm = bcdToDec(Wire.read());
    yy = CENTURY + bcdToDec(Wire.read());

  }
}


byte decToBcd(byte val){
  // Convert normal decimal numbers to binary coded decimal
  return ( (val/10*16) + (val%10) );
}

byte bcdToDec(byte val)  {
  // Convert binary coded decimal to normal decimal numbers
  return ( (val/16*10) + (val%16) );
}

int getLastTwoDigOfYear(int y){
  return(y%1000); 
}



void rtcWrite(){

  Wire.beginTransmission(DS1307_ADDRESS);
  Wire.write(zero); //stop Oscillator

  Wire.write(decToBcd(s));
  Wire.write(decToBcd(m));
  Wire.write(decToBcd(h));
  Wire.write(decToBcd(wkDay));
  Wire.write(decToBcd(dd));
  Wire.write(decToBcd(mm));
  Wire.write(decToBcd(getLastTwoDigOfYear(yy)));

  Wire.write(zero); //start

  Wire.endTransmission();


}




void setup()
{
  Serial.begin(9600);
  Wire.begin();
  Ethernet.begin(mac, ip);
  server.begin();
  Serial.print("server is at ");
  Serial.println(Ethernet.localIP());
} 
void loop()
{
  getRTCDateTime();
  Ethernet_webserver();

  delay(1000);
}
void Ethernet_webserver()
{
  EthernetClient client = server.available();
  if (client) 
  {
    boolean currentLineIsBlank = true;
    while (client.connected()) {
      if (client.available()) {
        char c = client.read();
        if (c == '\n' && currentLineIsBlank) {
          // send a standard http response header
          client.println("HTTP/1.1 200 OK");
          client.println("Content-Type: text/html");
          client.println("Connnection: close");
          client.println();
          client.println("<!DOCTYPE HTML>");
          client.println("<html>");
          // add a meta refresh tag, so the browser pulls again every 5 seconds:
          client.println("<meta http-equiv=\"refresh\" content=\"5\">");
          // add sententence here
          client.print("LOCAL DATE :"); 
          client.print(dd);
          client.print("/");
          client.print(mm);
          client.print("/");
          client.print(yy); 
          client.println("
");   
          client.print("LOCAL TIME :"); 
          client.print(h);
          client.print("/");
          client.print(m);
          client.print("/");
          client.print(s); 
          client.println("
");
          client.println("</html>");
          break;
        }
        if (c == '\n') {
          // you're starting a new line
          currentLineIsBlank = true;
        } 
        else if (c != '\r') {
          // you've gotten a character on the current line
          currentLineIsBlank = false;
        }
      }
    }
    // give the web browser time to receive the data
    delay(1);
    // close the connection:
    client.stop();
    Serial.println("client disonnected");
  }
}
#2

In Below Code . i can control the led depend on status. if checked light will blink else light get off. Similar thing i would like to make edit date and time

#include <SPI.h>
#include <Ethernet.h>

// MAC address from Ethernet shield sticker under board
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
IPAddress ip(192, 168, 1, 178); // IP address, may need to change depending on network
EthernetServer server(80);  // create a server at port 80

String HTTP_req;          // stores the HTTP request
boolean LED_status = 0;   // state of LED, off by default

void setup()
{
    Ethernet.begin(mac, ip);  // initialize Ethernet device
    server.begin();           // start to listen for clients
    Serial.begin(9600);       // for diagnostics
    pinMode(8, OUTPUT);       // LED on pin 2
}

void loop()
{
    EthernetClient client = server.available();  // try to get client

    if (client) {  // got client?
        boolean currentLineIsBlank = true;
        while (client.connected()) {
            if (client.available()) {   // client data available to read
                char c = client.read(); // read 1 byte (character) from client
                HTTP_req += c;  // save the HTTP request 1 char at a time
                // last line of client request is blank and ends with \n
                // respond to client only after last line received
                if (c == '\n' && currentLineIsBlank) {
                    // send a standard http response header
                    client.println("HTTP/1.1 200 OK");
                    client.println("Content-Type: text/html");
                    client.println("Connection: close");
                    client.println();
                    // send web page
                    client.println("<!DOCTYPE html>");
                    client.println("<html>");
                    client.println("<head>");
                    client.println("<title>Arduino LED Control</title>");
                    client.println("</head>");
                    client.println("<body>");
                    client.println("<h1>LED</h1>");
                    client.println("<p>Click to switch LED on and off.</p>");
                    client.println("<form method=\"get\">");
                    ProcessCheckbox(client);
                    client.println("</form>");
                    client.println("</body>");
                    client.println("</html>");
                    Serial.print(HTTP_req);
                    HTTP_req = "";    // finished with request, empty string
                    break;
                }
                // every line of text received from the client ends with \r\n
                if (c == '\n') {
                    // last character on line of received text
                    // starting new line with next character read
                    currentLineIsBlank = true;
                } 
                else if (c != '\r') {
                    // a text character was received from client
                    currentLineIsBlank = false;
                }
            } // end if (client.available())
        } // end while (client.connected())
        delay(1);      // give the web browser time to receive the data
        client.stop(); // close the connection
    } // end if (client)
}

// switch LED and send back HTML for LED checkbox
void ProcessCheckbox(EthernetClient cl)
{
    if (HTTP_req.indexOf("LED2=2") > -1) {  // see if checkbox was clicked
        // the checkbox was clicked, toggle the LED
        if (LED_status) {
            LED_status = 0;
        }
        else {
            LED_status = 1;
        }
    }
    
    if (LED_status) {    // switch LED on
        digitalWrite(8, HIGH);
        // checkbox is checked
        cl.println("<input type=\"checkbox\" name=\"LED2\" value=\"2\" \
        onclick=\"submit();\" checked>LED2");
    }
    else {              // switch LED off
        digitalWrite(8, LOW);
        // checkbox is unchecked
        cl.println("<input type=\"checkbox\" name=\"LED2\" value=\"2\" \
        onclick=\"submit();\">LED2");
    }
}
#3