add sleep & date, thanks kamil

date.c

@@ -0,0 +1,32 @@
+/* See LICENSE file for copyright and license details. */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include "util.h"
+
+int
+main(int argc, char *argv[])
+{
+	char buf[BUFSIZ];
+	char *fmt = "%c";
+	int i;
+	struct tm *now = NULL;
+	time_t t;
+
+	t = time(NULL);
+	for(i = 1; i < argc; i++)
+		if(!strncmp("+", argv[i], 1))
+			fmt = &argv[i][1];
+		else if(!strcmp("-d", argv[i]) && i+1 < argc)
+			t = strtol(argv[++i], NULL, 0);
+		else
+			eprintf("usage: %s [-d time] [+format]\n", argv[0]);
+	now = localtime(&t);
+	if(!now)
+		eprintf("localtime failed\n");
+
+	strftime(buf, sizeof buf, fmt, now);
+	puts(buf);
+	return EXIT_SUCCESS;
+}