Revise maximum length for date time in log. Closes #1777

Author: Mr-Dave

src/logger.c

@@ -154,13 +154,11 @@ FILE * set_logfile(const char *logfile_name)
  */
 static char *str_time(void)
 {
-    //static char buffer[16]; // the month differs depending on the language. ex)LANG=ja_JP.UTF-8
-    static char buffer[18];
+    static char buffer[30]; /* Arbitrary length*/
     time_t now = 0;
 
     now = time(0);
-    //strftime(buffer, 16, "%b %d %H:%M:%S", localtime(&now));
-    strftime(buffer, 18, "%b %d %H:%M:%S", localtime(&now));
+    strftime(buffer, sizeof(buffer), "%b %d %H:%M:%S", localtime(&now));
     return buffer;
 }