Time on microcontroller (PIC16f877a)

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// LCD module connections
sbit LCD_RS at RC2_bit;
sbit LCD_EN at RC3_bit;
sbit LCD_D4 at RC4_bit;
sbit LCD_D5 at RC5_bit;
sbit LCD_D6 at RC6_bit;
sbit LCD_D7 at RC7_bit;
 
sbit LCD_RS_Direction at TRISC2_bit;
sbit LCD_EN_Direction at TRISC3_bit;
sbit LCD_D4_Direction at TRISC4_bit;
sbit LCD_D5_Direction at TRISC5_bit;
sbit LCD_D6_Direction at TRISC6_bit;
sbit LCD_D7_Direction at TRISC7_bit;
// End LCD module connections
 
unsigned cnt;              // This is the counter variable which will extend desired period
char abc[7];
int clk2;
 
void InitTimer0(){
  OPTION_REG = 0x84;       // Prescaler 256
  TMR0 = 100;
  INTCON = 0xA0;
}
 
void Interrupt(){          // Occurs every 1ms
  if (TMR0IF_bit){
        cnt++;                 // Increment counter, this is the tweak we added in original Timer Calculator code
        TMR0IF_bit = 0;        // Clear TMR0IF
        TMR0       = 100;       // Prepare for next interrupt
  }
}
 
void display(){
  Lcd_Cmd(_LCD_CLEAR);               // Clear display
  Lcd_Cmd(_LCD_CURSOR_OFF);          // Cursor off
  IntToStr(clk2, abc);
  Lcd_Out(1,1,abc);      // Write text'Hello World' in first row
  }
 
void main() {
  InitTimer0();            // Initialize Timer0
 
 
 TRISD.F1 = 0; //Configure 1st bit of PORTD as output
  PORTD.F1 = 0; //LED OFF
  TRISD.F0 = 1; //Configure 1st bit of PORTD as input
  TRISD.F2 = 1; //Configure 1st bit of PORTD as input
  
 
  cnt = 0;                 // Initialize cnt
 
  Lcd_Init();                        // Initialize LCD
  Lcd_Cmd(_LCD_CLEAR);               // Clear display
  Lcd_Cmd(_LCD_CURSOR_OFF);          // Cursor off
  Lcd_Out(1,1,"Hello");      // Write text'Hello World' in first row
 
 
  do {
        if(PORTD.F0 == 0)   //If the switch is pressed
        {
        Delay_ms(100);    //Switch Debounce
       if(PORTD.F0 == 0)//If the switch is still pressed
       {
         cnt = 0;
 
         PORTD.F1 = 1;
 
          }
 
        }
 
      if(PORTD.F2 == 0)   //If the switch is pressed
        {
        Delay_ms(100);    //Switch Debounce
       if(PORTD.F2 == 0)//If the switch is still pressed
          PORTD.F1 = 1;
        clk2 = cnt;
       Display();
       }
  } while(1);
}