Calculate Time in Linux

Calculating time in LINUX in milliseconds and Seconds. We should include sys/time.h header file and the remaining sample code is

struct timeval start;

we wil be using gettimeofday system call whose syntax is
int gettimeofday(struct timeval *tv, struct timezone *tz); where

struct timeval
{
time_t tv_sec;···············/* seconds */
suseconds_t tv_usec;······/* microseconds */
};


/* To calculate time in seconds*/

gettimeofday(&start, NULL);
starttime = start.tv_sec + start.tv_usec/1000000;

/* To calculate time in milliseconds*/

gettimeofday(&start, NULL);
starttime = start.tv_sec*1000 + start.tv_usec/1000;