Simple Digital Clock implementation ?

Thanks, from the link you gave me, I only need part of it's code.

Now it seems I need to write code that implement tick timer (see below) & re-implement time.h / time.c  so I can fetch the correct  hour/min/day/month/year value from my own customized C library "time.h"

#pragma vector=TIMER0_A0_VECTOR
__interrupt void Timer_A (void)
{
    g_systemCounter++;
 
   // Check if we reached 1 second.
   if (g_systemCounter >=1000)
   {        
      seconds++;
      hseconds = 0;

      if(seconds>=60)
      {
      minutes++;
      seconds = 0;
      }

      if(minutes >=60)
      {
      hours++;
      minutes = 0;
      }
      
      OLED_PrintfSetColumnRow(7,1,LARGE_FONT);
       OLED_Printf("%d%d:%d%d:%d%d", hours/10,
                                               hours%10,
                                               minutes/10,
                                               minutes%10,
                                               seconds/10,
                                               seconds%10);       

      // Reset system counter.
      g_systemCounter = 0;
   }
}