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diff --git a/libmailutils/datetime/dow.c b/libmailutils/datetime/dow.c
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+/* GNU Mailutils -- a suite of utilities for electronic mail
+ Copyright (C) 2011 Free Software Foundation, Inc.
+
+ 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 3 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, see
+ <http://www.gnu.org/licenses/>. */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+#include <stdlib.h>
+#include <mailutils/datetime.h>
+
+/* Compute day of week (0 - Sunday) */
+int
+mu_datetime_dayofweek (int year, int month, int day)
+{
+ return (mu_datetime_julianday (year, month, day) + 1) % 7;
+}

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