The C Programming Language - Pointers

For this we need the function time(), which is defined in the header file . This
function returns the UTC time in seconds.
Syntax:
time_t time(time_t *second)
/* example 137 - get UTC time in seconds */
#include
#include
void getSecondsUTC(unsigned long *ptr_time) {
// get the current number of secondsonds since 1970.01.01 00:00:00 UTC
*ptr_time = time(NULL);
}
int main (void)
{
unsigned long seconds;
getSecondsUTC(&seconds);
// pass the address of seconds
printf("Number of seconds since 1970.01.01: %ld\n", seconds);
printf("Number of minutes since 1970.01.01: %ld\n", seconds/60);
printf("Number of hours since 1970.01.01: %ld\n", seconds/3600);
printf("Number of days since 1970.01.01: %ld\n", seconds/(3600*24));
}
return 0;
Number of seconds since 1970.01.01: 1674053452
Number of minutes since 1970.01.01: 27900890
Number of hours since 1970.01.01: 465014
Number of days since 1970.01.01: 19375
The C Programming Language by Heimo Gaicher – Chapter Pointers 20