added days_to_ymd() and ymd_to_days()

diff --git a/time.php b/time.php
new file mode 100644 (file)
index 0000000..501d89c
--- /dev/null
+++ b/time.php
@@ -0,0 +1,47 @@
+<?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>";
+#      }
+#}