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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#pragma once
+
+namespace i18nutil
+{
+/** This number shows month days without Jan and Feb.
+ * According to the article, it is calculated as (365-31-28)/10 = 30.6, but because
+ * of a floating point bug, it was used as 30.6001 as a workaround.
+ *
+ * "30.6001, 25 year old hack?"
+ * https://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/archv011.cgi?read=31650 */
+constexpr double monthDaysWithoutJanFeb = (365 - 31 - 28) / 10.0;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */