+/*
+ * Copyright (C) 2016 Thadeu Lima de Souza Cascardo <cascardo@minaslivre.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef _ANO_H
+#define _ANO_H
+
+#define PRIMEIRO_ANO 2015
+#define ULTIMO_ANO 2015
+#define MAX_ANOS (ULTIMO_ANO + 1)
+#define ANO(ano) (ano - PRIMEIRO_ANO)
+#define ANO_VALIDO(ano) (ANO(ano) >= 0 && ANO(ano) < ANO(MAX_ANOS))
+
+#endif