Include 'running since' in the footer

timer.c

@@ -0,0 +1,24 @@
+#include <time.h>
+#include <stddef.h>
+#include <stdio.h>
+
+#include "timer.h"
+
+time_t rawtime;
+
+void start_timer(void)
+{
+    time(&rawtime);
+}
+
+void get_timer_string(char *output, size_t size)
+{
+    struct tm * timeinfo;
+    
+    timeinfo = localtime(&rawtime);
+    
+    snprintf(output, size, "[%02d %02d %d %02d:%02d:%02d]", timeinfo->tm_mday,
+            timeinfo->tm_mon + 1, timeinfo->tm_year + 1900,
+            timeinfo->tm_hour, timeinfo->tm_min, timeinfo->tm_sec);
+}
+