Function that returns the current date in string format.

get_localtime.c

#include <stdio.h>
#include <stdlib.h>
#include <sys/time.h>
#include <time.h>

/**
 * Function that returns the current date in string format.
 * 
 * Output format example: "2018-1-4 10:17:12.508977"
 * 
 * @param buffer String pointer.
 * @param size String size.
 */
void get_localtime(char * buffer, int size) {
	struct timeval s_tv;
	struct tm s_tm;

	gettimeofday(&s_tv, NULL);
	localtime_r(&s_tv.tv_sec, &s_tm);
	snprintf(buffer, size, "%d-%d-%d %d:%d:%d.%li",
			s_tm.tm_year + 1900,
			s_tm.tm_mon + 1,
			s_tm.tm_mday,
			s_tm.tm_hour,
			s_tm.tm_min,
			s_tm.tm_sec,
			s_tv.tv_usec
	);
}

int main() {
	char buffer[32];

	get_localtime(buffer, sizeof(buffer));
	printf("%s \n", buffer);

	return 0;
}