--- /dev/null
+<?php
+
+# Copyright (C) 2007 Jason Woofenden
+#
+# This file is part of wfpl.
+#
+# wfpl 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.
+#
+# wfpl 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 wfpl; if not, write to the Free Software Foundation, Inc., 51
+# Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+
+
+# This file contains functions to manipulate/calculate dates/times
+
+function ymd_to_days($year, $month, $day) {
+ return (int)(mktime(12,0,0,$month,$day, $year, 0) / 86400);
+}
+
+function days_to_ymd($days) {
+ return explode('-', date('Y-n-j', $days * 86400 + 43200));
+}
+
+function days_to_weekday_name($days) {
+ $day_names = array('Thursday', 'Friday', 'Saturday', 'Sunday', 'Monday', 'Tuesday', 'Wednesday');
+ return $day_names[$days % 7];
+}
+
+
+#function time_test() {
+# for($i = 0; $i < 41 * 86400; $i += 86399) {
+# echo "seconds: $i";
+# $days = (int)($i / 86400);
+# list($year, $month, $day) = days_to_ymd($days);
+# echo ", days_to_ymd($days): $year-$month-$day";
+# $days = ymd_to_days($year, $month, $day);
+# echo ", ymd_to_days($year, $month, $day): $days\n<br>";
+# }
+#}