my timer0 code is not working in MicroC ?? anyone please !!!!

Code C - [expand]
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// LCD module connections
sbit LCD_RS at RB4_bit;
sbit LCD_EN at RB5_bit;
sbit LCD_D4 at RB0_bit;
sbit LCD_D5 at RB1_bit;
sbit LCD_D6 at RB2_bit;
sbit LCD_D7 at RB3_bit;
 
sbit LCD_RS_Direction at TRISB4_bit;
sbit LCD_EN_Direction at TRISB5_bit;
sbit LCD_D4_Direction at TRISB0_bit;
sbit LCD_D5_Direction at TRISB1_bit;
sbit LCD_D6_Direction at TRISB2_bit;
sbit LCD_D7_Direction at TRISB3_bit;
// End LCD module connections
char txt1[8];
int overflow=0;
int time=0;
 
void interrupt()
{
 
 if(t0if==1)
 {
 t0if_bit=0;
 overflow++;
 
 }
}
void main() {
 lcd_init();
 lcd_cmd(_lcd_clear);
 lcd_cmd(_lcd_cursor_off);
 option_reg=0b00000111;
 gie_bit=1;
 t0ie_bit=1;
 t0if_bit=0;
 
 while(1)
 {
  if(overflow==15)
  {
  time++;
  inttostr(time,txt1);
  lcd_out(1,3,txt1);
  }
 }
}

Code C - [expand]
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while(1) {
    if ( overflow >= 15 ) {
      overflow = 0; // !!!!!!!!!!!!!!!
      time++;
      inttostr(time, txt1);
      lcd_out(1,3, txt1);
    }
}