How to get the current time in milliseconds in C Programming?

http://stackoverflow.com/questions/8558625/how-to-get-the-current-time-in-milliseconds-in-c-programming

#include<stdio.h>
#include<time.h>

int main()
{
clock_t t1, t2;

t1 = clock();

int i;

for(i = 0;i < 1000000 ;i++)
{
int x = 90;
}

t2 = clock();

float diff = (((float)t2 - (float)t1) / 1000000.0F ) * 1000;
printf("%f",diff);

return 0;
}