Add herbe (notification display)

programs/slstatus/components/datetime.c

@@ -0,0 +1,20 @@
+/* See LICENSE file for copyright and license details. */
+#include <stdio.h>
+#include <time.h>
+
+#include "../slstatus.h"
+#include "../util.h"
+
+const char *
+datetime(const char *fmt)
+{
+	time_t t;
+
+	t = time(NULL);
+	if (!strftime(buf, sizeof(buf), fmt, localtime(&t))) {
+		warn("strftime: Result string exceeds buffer size");
+		return NULL;
+	}
+
+	return buf;
+}