How can I read date and time data from RTC of sim900 module using arduino? -

#include "sim900.h" #include <softwareserial.h> #include "sms.h"  smsgsm sms;  boolean started=false; int count = 0;   void setup() {  pinmode(5, input);          // input pin switch    serial.begin(9600);   if (gsm.begin(2400))  {    serial.println("\nstatus=ready");    started=true;    }  else serial.println("\nstatus=idle");  delay(1000);   }   void loop()                                     {   if (digitalread(5)==1)    {     delay(500);     if (digitalread(5)==1)     {       count = count+1;       /*if(started)       {         if (sms.sendsms("+12345678", "alarm"))         serial.println("\nsms sent ok");       }*/                 serial.println("count = ");       serial.println(count);        readtime();       serial.println(content);     }    }   else    {     serial.println("normal");   } } 

i use sim 900 arduino detect change of input pin 5 , alarm user. have few question need help

1. how can know pin sim 900 use communicated sent sms? use jumper @ d2 , d3. did use these 2 pins? because in program use .h include file didn't know detail inside it.
2. how can read date , time data rtc in sim 900 module , store in variable , use them data logger later? know if have set date , time in rtc, can read "at+cclk?" , return date , time data. how can use command in program?

i found code , work me. first ask time , expect answers , parse it.

const char* const  sim900::gettimestamp(){  serial2.print("at+cclk?");      //sim900 @ command time stamp  serial2.print(13,byte);    delay(2000);  if (serial2.available()>0){    int = 0;            while (serial2.available()>0){                  timestamp[i]=(serial2.read());               i++;                          }         }   int years = (((timestamp[25])-48)*10)+((timestamp[26])-48);   int months = (((timestamp[22])-48)*10)+((timestamp[23])-48);   int days  = (((timestamp[19])-48)*10)+((timestamp[20])-48);   int hours = (((timestamp[28])-48)*10)+((timestamp[29])-48);   int mins = (((timestamp[31])-48)*10)+((timestamp[32])-48);   int secs = (((timestamp[34])-48)*10)+((timestamp[35])-48);   //your code here }