Revamp date/time calculations.

* configure.ac: Build libmailutils/datetime/Makefile.am
* include/mailutils/datetime.h (mu_datetime_julianday)
(mu_datetime_dayofweek,mu_datetime_dayofyear)
(mu_datetime_year_days): New protos.
* libmailutils/Makefile.am (SUBDIRS): Add datetime
(libmailutils_la_LIBADD): Add libdatetime.la
* libmailutils/base/Makefile.am (libbase_la_SOURCES): Remove date.c
and strftime.c.
* libmailutils/base/date.c: Remove.
* libmailutils/base/strftime.c: Move to libmailutils/datetime
* libmailutils/datetime/Makefile.am: New file.
* libmailutils/datetime/dow.c: New file.
* libmailutils/datetime/doy.c: New file.
* libmailutils/datetime/jd.c: New file.
* libmailutils/datetime/scantime.c: New file.
* libmailutils/datetime/streamftime.c: New file.
* libmailutils/datetime/tab.c: New file.
* libmailutils/datetime/unixtime.c: New file.
* libmailutils/datetime/utcoff.c: New file.
* libmailutils/datetime/yd.c: New file.
* libmailutils/tests/scantime.at: Fix yday numbers.

1 files changed, 29 insertions, 0 deletions

diff --git a/libmailutils/datetime/dow.c b/libmailutils/datetime/dow.c
new file mode 100644
index 000000000..9f94a6803
--- /dev/null
+++ b/libmailutils/datetime/dow.c
@@ -0,0 +1,29 @@
+/* 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;
+}