sortix--sortix/utils/date.c

/*
 * Copyright (c) 2013 Jonas 'Sortie' Termansen.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 * date.c
 * Print or set system date and time.
 */

#include <errno.h>
#include <error.h>
#include <stdio.h>
#include <stdint.h>
#include <time.h>

int main(void)
{
	time_t current_time = time(NULL);

	struct tm tm;
	if ( !localtime_r(&current_time, &tm) )
		error(1, errno, "time(%ji)", (intmax_t) current_time);

	const size_t BUFFER_SIZE = 256;
	char buffer[BUFFER_SIZE];
	strftime(buffer, BUFFER_SIZE, "%a %b %d %H:%M:%S %Y", &tm);
	printf("%s\n", buffer);

	return 0;
}