From 3b792fd533f1ddd5f6603e8c1eefda9ab5d5b782 Mon Sep 17 00:00:00 2001
From: Guido <guidobuiting@gmail.com>
Date: Tue, 11 Jul 2017 23:37:54 +0200
Subject: [PATCH 1/4] Updated the DateTime format to use the format field
 instead of the static value

---
 src/Element/DateTime.php | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/Element/DateTime.php b/src/Element/DateTime.php
index 88d9135e..e3ac1e9d 100644
--- a/src/Element/DateTime.php
+++ b/src/Element/DateTime.php
@@ -135,7 +135,7 @@ protected function getValidators()
             throw new InvalidArgumentException(sprintf(
                 '%1$s expects "min" to conform to %2$s; received "%3$s"',
                 __METHOD__,
-                static::DATETIME_FORMAT,
+                $this->format,
                 $this->attributes['min']
             ));
         }
@@ -153,7 +153,7 @@ protected function getValidators()
             throw new InvalidArgumentException(sprintf(
                 '%1$s expects "max" to conform to %2$s; received "%3$s"',
                 __METHOD__,
-                static::DATETIME_FORMAT,
+                $this->format,
                 $this->attributes['max']
             ));
         }
@@ -226,7 +226,7 @@ public function getInputSpecification()
     private function valueIsValidDateTimeFormat($value)
     {
         return PhpDateTime::createFromFormat(
-            static::DATETIME_FORMAT,
+            $this->format,
             $value
         ) instanceof DateTimeInterface;
     }

From b7f9cd8c5cbc60256e3f48e9ce5d9e25243b8688 Mon Sep 17 00:00:00 2001
From: Guido <guidobuiting@gmail.com>
Date: Tue, 11 Jul 2017 23:39:57 +0200
Subject: [PATCH 2/4] Fixed broken tests. Updated the formats within the tests.

---
 test/Element/DateTest.php  | 4 ++--
 test/Element/MonthTest.php | 1 +
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/test/Element/DateTest.php b/test/Element/DateTest.php
index 0c5d49e0..0ef6795b 100644
--- a/test/Element/DateTest.php
+++ b/test/Element/DateTest.php
@@ -125,8 +125,8 @@ public function testCorrectFormatPassedToDateValidator()
     {
         $element = new DateElement('foo');
         $element->setAttributes([
-            'min'       => '2012-01-01',
-            'max'       => '2012-12-31',
+            'min'       => '01-01-2012',
+            'max'       => '31-12-2012',
         ]);
         $element->setFormat('d-m-Y');
 
diff --git a/test/Element/MonthTest.php b/test/Element/MonthTest.php
index 6f8d17ca..d91a014b 100644
--- a/test/Element/MonthTest.php
+++ b/test/Element/MonthTest.php
@@ -17,6 +17,7 @@ class MonthTest extends TestCase
     public function testProvidesInputSpecificationThatIncludesValidatorsBasedOnAttributes()
     {
         $element = new MonthElement('foo');
+        $element->setFormat('Y-m');
         $element->setAttributes([
             'inclusive' => true,
             'min'       => '2000-01',

From 9eaecdcf387aa1ec12911f90e091366279c89287 Mon Sep 17 00:00:00 2001
From: Guido Buiting <g.buiting@moxx-mobility.com>
Date: Wed, 12 Jul 2017 09:23:19 +0200
Subject: [PATCH 3/4] Added the format field to the Element\Month. Updated the
 test to no longer set the format for the Element\Month.

---
 src/Element/Month.php      | 7 +++++++
 test/Element/MonthTest.php | 1 -
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/Element/Month.php b/src/Element/Month.php
index a5e24d2b..104f56d4 100644
--- a/src/Element/Month.php
+++ b/src/Element/Month.php
@@ -18,6 +18,13 @@ class Month extends DateTime
 
     const DATETIME_FORMAT = 'Y-m';
 
+    /**
+     * A valid format string accepted by date()
+     *
+     * @var string
+     */
+    protected $format = self::DATETIME_FORMAT;
+
     /**
      * Seed attributes
      *
diff --git a/test/Element/MonthTest.php b/test/Element/MonthTest.php
index d91a014b..6f8d17ca 100644
--- a/test/Element/MonthTest.php
+++ b/test/Element/MonthTest.php
@@ -17,7 +17,6 @@ class MonthTest extends TestCase
     public function testProvidesInputSpecificationThatIncludesValidatorsBasedOnAttributes()
     {
         $element = new MonthElement('foo');
-        $element->setFormat('Y-m');
         $element->setAttributes([
             'inclusive' => true,
             'min'       => '2000-01',

From 78fed36fc9bfbc69cb354d2c79224757c5ff12d7 Mon Sep 17 00:00:00 2001
From: Matthew Weier O'Phinney <matthew@zend.com>
Date: Wed, 6 Dec 2017 14:21:51 -0600
Subject: [PATCH 4/4] Adds CHANGELOG entry for #172

---
 CHANGELOG.md | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 927fa299..dfdbce3a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -29,6 +29,12 @@ All notable changes to this project will be documented in this file, in reverse
   binding values in a fieldset will correctly identify the elements in the
   provided data.
 
+- [#172](https://github.com/zendframework/zend-form/pull/172) fixes the
+  `DateTime` element such that it no longer attempts to use its
+  `DATETIME_FORMAT` constant, but, rather, the value of the `$format` property,
+  when representing the element; this change allows developers to override the
+  format, which was the original intention.
+
 ## 2.10.3 - TBD
 
 ### Added