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diff --git a/src/common.h b/src/common.h
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+/*
+ * common.h
+ * contains some common functions
+ *
+ * Copyright (c) 2026 Nikias Bassen, All Rights Reserved.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+#ifndef COMMON_H
+#define COMMON_H
+
+#include <stddef.h>
+
+#define MAC_EPOCH 978307200
+
+size_t dtostr(char *buf, size_t bufsize, double realval);
+int num_digits_i(int64_t i);
+int num_digits_u(uint64_t i);
+
+#endif