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-rw-r--r--libmailutils/datetime/utcoff.c32
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diff --git a/libmailutils/datetime/utcoff.c b/libmailutils/datetime/utcoff.c
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+++ b/libmailutils/datetime/utcoff.c
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+/* GNU Mailutils -- a suite of utilities for electronic mail
+ Copyright (C) 1999, 2000, 2001, 2007, 2009, 2010, 2011 Free Software
+ Foundation, Inc.
+
+ GNU Mailutils 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, or (at your option)
+ any later version.
+
+ GNU Mailutils 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 GNU Mailutils. If not, see <http://www.gnu.org/licenses/>. */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+#include <time.h>
+
+/* Convert time 0 at UTC to our localtime, that tells us the offset
+ of our current timezone from UTC. */
+time_t
+mu_utc_offset (void)
+{
+ time_t t = 0;
+ struct tm *tm = gmtime (&t);
+
+ return - mktime (tm);
+}

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