while(1) { for(x=0;x<60;x++) display(); // clear "//" formthe next line to show the counter > each 7seg count from 0 to 9 // for(x=0;x<16;x++){num[x]++; if(num[x]==10)num[x]=0;} }

أقراء تفاصيل أكثر من http://www.qariya.com/vb/showthread.php?p=846628&posted=1#post846628#ixzz2vAbtxV7j 
Follow us: qariya on Facebook

static void set_DS1307(unsigned  char set_switch,unsigned  char inc_dec_system_12_24)
 {
   if(set_switch==0)// start value
              {
               setting_DS1307[0]=hours;
               setting_DS1307[1]=minutes;
               setting_DS1307[2]=seconds;
               setting_DS1307[3]=day;
               setting_DS1307[4]=week;
               setting_DS1307[5]=month;
               setting_DS1307[6]=year;
              }
   if(set_switch==9)//write new data to DS1307
                   {
                     if(inc_dec_system_12_24==24)kw_12_24=24;
                     else if(inc_dec_system_12_24==12)kw_12_24=12;
                     Show_Time(setting_DS1307[0],setting_DS1307[1],setting_DS1307[2],setting_DS1307[3],
                               setting_DS1307[4],setting_DS1307[5],setting_DS1307[6],0);
                   }

while(1)
  {
    if (Button(&PORTA, 0, 100, 0)) // set switch
                                {
                                 kk=0;
                                 if(set==0)set_DS1307(0,255);// to sore data in setting_DS1307 before change value
                                 set++;
                                 lcd_cmd(1);
                                 if(set>=9)
                                          {
                                            kk=255;
                                            LCD_Chr(1,8,'.');
                                            LCD_Chr(1,11,'.');
                                            LCD_Out(2,1,"Time ");
                                            LCD_Chr(2,8,':');
                                            LCD_Chr(2,11,':');
                                            LCD_Out(1,12,"20");
                                            set_DS1307(set,system_12_24);
                                            set=0;
                                          }

   if(kk!=255 && set !=8)
             {
              Lcd_Chr(1, 14, (setting_DS1307[set-1]/ 10) + 48);
              Lcd_Chr(1,15, (setting_DS1307[set-1] % 10) + 48);
             }

if (Button(&PORTA, 1, 150, 0)) // dec switch
                                {
                                 set_DS1307(set,1);
                                 if(set ==8){
                                               lcd_out(1,8,"24");
                                               system_12_24=24;
                                             }
                                }
   if (Button(&PORTA, 2, 150, 0)) // inc switch
                                {
                                 set_DS1307(set,0);
                                 if(set ==8)
                                            {
                                             lcd_out(1,8,"12");
                                             system_12_24=12;
                                            }

                                }

static void Show_Time(unsigned char c_hours, unsigned char c_minutes, unsigned char c_seconds,
                unsigned char c_day, unsigned char c_week, unsigned char c_month, unsigned char c_year,unsigned char states)
{ 

 if(states==0){
                c_hours=dec2bcd(c_hours);
                c_minutes=dec2bcd(c_minutes);
                c_seconds=dec2bcd(c_seconds);
                c_day=dec2bcd(c_day);
                c_month=dec2bcd(c_month);
                c_year=dec2bcd(c_year);
                Write_Time(c_hours,c_minutes,c_seconds,c_day,c_week,c_month,c_year);
              }

 Read_Time(&hours, &minutes, &seconds, &day, &week, &month, &year);
 seconds  =  ((seconds & 0x70) >> 4)*10 + (seconds & 0x0F);
 minutes  =  ((minutes & 0xF0) >> 4)*10 + (minutes & 0x0F);
 hours =((hours & 0x10) >> 4)*10  + (hours& 0x0F);[COLOR="DimGray"]
 if(kw_12_24==24)k_12_24=24;//for system 24
 else if(kw_12_24==12)// for system 12
                    {
                    
                     if(hours <= 12 )
                                     {
                                       k_12_24=0; // this mean AM,
                                       if(hours==0)hours=1;
                                     }
                     if(hours >= 13)
                                {
                                 k_12_24=1;//this mean PM,
                                 hours = hours -12;
                                }
                     }
 week     =  (week & 0x07);
 day      =  ((day & 0xF0) >> 4)*10 + (day & 0x0F);
 month    =  ((month & 0x10) >> 4)*10 + (month & 0x0F);
 year     =  ((year & 0xF0)>>4)*10+(year & 0x0F);