From 8e41b51cb7d508384e561b9c6caabe43a6cadb9f Mon Sep 17 00:00:00 2001
From: Andrew Koebbe <abk@stowers.org>
Date: Thu, 20 Aug 2015 23:37:29 -0500
Subject: [PATCH] Allow the use of any custom page date field for dateRange
 collection filtering.

---
 system/src/Grav/Common/Page/Collection.php | 11 ++++++++---
 system/src/Grav/Common/Page/Page.php       |  3 ++-
 2 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/system/src/Grav/Common/Page/Collection.php b/system/src/Grav/Common/Page/Collection.php
index 9cd237c04..76701c9b4 100644
--- a/system/src/Grav/Common/Page/Collection.php
+++ b/system/src/Grav/Common/Page/Collection.php
@@ -211,17 +211,19 @@ class Collection extends Iterator
     }
 
     /**
-     * Returns the items between a set of date ranges where second value is optional
+     * Returns the items between a set of date ranges of either the page date field (default) or
+     * an arbitrary datetime page field where end date is optional
      * Dates can be passed in as text that strtotime() can process
      * http://php.net/manual/en/function.strtotime.php
      *
+     * @param      $field
      * @param      $startDate
      * @param bool $endDate
      *
      * @return $this
      * @throws \Exception
      */
-    public function dateRange($startDate, $endDate = false)
+    public function dateRange($field = false, $startDate, $endDate = false)
     {
         $start = strtotime($startDate);
         $end = $endDate ? strtotime($endDate) : strtotime("now +1000 years");
@@ -230,7 +232,10 @@ class Collection extends Iterator
 
         foreach ($this->items as $path => $slug) {
             $page = $this->pages->get($path);
-            if ($page->date() > $start && $page->date() < $end) {
+
+            $date = $field ? strtotime($page->value($field)) : $page->date();
+
+            if ($date > $start && $date < $end) {
                 $date_range[$path] = $slug;
             }
         }
diff --git a/system/src/Grav/Common/Page/Page.php b/system/src/Grav/Common/Page/Page.php
index ab2d3426c..25df98edd 100644
--- a/system/src/Grav/Common/Page/Page.php
+++ b/system/src/Grav/Common/Page/Page.php
@@ -1841,9 +1841,10 @@ class Page
         // TODO: END OF MOVE
 
         if (isset($params['dateRange'])) {
+            $field = isset($params['dateRange']['field']) ? $params['dateRange']['field'] : false;
             $start = isset($params['dateRange']['start']) ? $params['dateRange']['start'] : 0;
             $end = isset($params['dateRange']['end']) ? $params['dateRange']['end'] : false;
-            $collection->dateRange($start, $end);
+            $collection->dateRange($field, $start, $end);
         }
 
         if (isset($params['order'])) {