How to get the time period of a pulse in mikroc pro

// LCD module connections
sbit LCD_RS at RD4_bit;
sbit LCD_EN at RD5_bit;
sbit LCD_D4 at RD0_bit;
sbit LCD_D5 at RD1_bit;
sbit LCD_D6 at RD2_bit;
sbit LCD_D7 at RD3_bit;

sbit LCD_RS_Direction at TRISD4_bit;
sbit LCD_EN_Direction at TRISD5_bit;
sbit LCD_D4_Direction at TRISD0_bit;
sbit LCD_D5_Direction at TRISD1_bit;
sbit LCD_D6_Direction at TRISD2_bit;
sbit LCD_D7_Direction at TRISD3_bit;
// End LCD module connections
unsigned int t;
char tStr[16];

void printTime(){
Lcd_Cmd(_LCD_CURSOR_OFF);
Lcd_Cmd(_LCD_CLEAR);
t = TMR0L;
IntToStr(t,tStr);
Lcd_Out(1,1,tStr);
}

void interrupt(void){
   if(RB0_bit == 1){
   TMR0ON_bit = 1;//on timer1
   RC0_bit = 1;
   INT0IF_bit = 0;
   INTEDG0_bit = 0;
   }
   if(RB0_bit == 0){
    TMR0ON_bit = 0;//stops timer1
    RC0_bit = 0;
    INT0IF_bit = 0;
    INTEDG0_bit = 1;
    printTime();
   }
}

void main() {
TRISC0_bit = 0;
TRISB = 1;
INTCON.GIE = 1;//enable global interrupts
INTCON.INT0IE =  1;//enable external interrupts
INTCON.PEIE = 0; //disable all unmasked interrupts
INTEDG0_bit = 1;//interrupt on RB0 rising edge
T08BIT_bit = 0;//TMR0 configured as 16bit timer
T0CS_bit = 0;//use internal instruction cycle
PSA_bit = 1;//timer1 prescaler not assigned
Lcd_Init();
TMR0L = 0;
}