diff --git a/locales/es_ES/translations.php b/locales/es_ES/translations.php
index bf6f80e6d..4c036f002 100644
--- a/locales/es_ES/translations.php
+++ b/locales/es_ES/translations.php
@@ -289,4 +289,5 @@ return array(
     // 'Nothing found.' => '',
     // 'Search in the project "%s"' => '',
     // 'Due date' => '',
+    // 'Others formats accepted: %s and %s' => '',
 );
diff --git a/locales/fr_FR/translations.php b/locales/fr_FR/translations.php
index 54659276f..82467acd8 100644
--- a/locales/fr_FR/translations.php
+++ b/locales/fr_FR/translations.php
@@ -289,4 +289,5 @@ return array(
     'Nothing found.' => 'Rien trouvé.',
     'Search in the project "%s"' => 'Rechercher dans le projet « %s »',
     'Due date' => 'Date d\'échéance',
+    'Others formats accepted: %s and %s' => 'Autres formats acceptés : %s et %s',
 );
diff --git a/locales/pl_PL/translations.php b/locales/pl_PL/translations.php
index ed16779fe..a1be50d31 100644
--- a/locales/pl_PL/translations.php
+++ b/locales/pl_PL/translations.php
@@ -294,4 +294,5 @@ return array(
     // 'Nothing found.' => '',
     // 'Search in the project "%s"' => '',
     // 'Due date' => '',
+    // 'Others formats accepted: %s and %s' => '',
 );
diff --git a/locales/pt_BR/translations.php b/locales/pt_BR/translations.php
index 54b357db9..54538b1ca 100644
--- a/locales/pt_BR/translations.php
+++ b/locales/pt_BR/translations.php
@@ -290,4 +290,5 @@ return array(
     // 'Nothing found.' => '',
     // 'Search in the project "%s"' => '',
     // 'Due date' => '',
+    // 'Others formats accepted: %s and %s' => '',
 );
diff --git a/models/task.php b/models/task.php
index bef92f207..f08f0b288 100644
--- a/models/task.php
+++ b/models/task.php
@@ -6,6 +6,7 @@ require_once __DIR__.'/base.php';
 
 use \SimpleValidator\Validator;
 use \SimpleValidator\Validators;
+use DateTime;
 
 /**
  * Task model
@@ -301,7 +302,7 @@ class Task extends Base
         }
 
         if (! empty($values['date_due']) && ! is_numeric($values['date_due'])) {
-            $values['date_due'] = $this->getTimestampFromDate($values['date_due'], t('m/d/Y')) ?: null;
+            $values['date_due'] = $this->parseDate($values['date_due']);
         }
 
         $values['date_creation'] = time();
@@ -334,7 +335,7 @@ class Task extends Base
     {
         // Prepare data
         if (! empty($values['date_due']) && ! is_numeric($values['date_due'])) {
-            $values['date_due'] = $this->getTimestampFromDate($values['date_due'], t('m/d/Y')) ?: null;
+            $values['date_due'] = $this->parseDate($values['date_due']);
         }
 
         $original_task = $this->getById($values['id']);
@@ -472,7 +473,7 @@ class Task extends Base
             new Validators\Integer('score', t('This value must be an integer')),
             new Validators\Required('title', t('The title is required')),
             new Validators\MaxLength('title', t('The maximum length is %d characters', 200), 200),
-            new Validators\Date('date_due', t('Invalid date'), t('m/d/Y')),
+            new Validators\Date('date_due', t('Invalid date'), $this->getDateFormats()),
         ));
 
         return array(
@@ -523,7 +524,7 @@ class Task extends Base
             new Validators\Integer('score', t('This value must be an integer')),
             new Validators\Required('title', t('The title is required')),
             new Validators\MaxLength('title', t('The maximum length is %d characters', 200), 200),
-            new Validators\Date('date_due', t('Invalid date'), t('m/d/Y')),
+            new Validators\Date('date_due', t('Invalid date'), $this->getDateFormats()),
         ));
 
         return array(
@@ -557,19 +558,19 @@ class Task extends Base
     }
 
     /**
-     * Parse a date (different format for each locale) to a timestamp
+     * Return a timestamp if the given date format is correct otherwise return 0
      *
      * @access public
      * @param  string   $value  Date to parse
      * @param  string   $format Date format
      * @return integer
      */
-    public function getTimestampFromDate($value, $format)
+    public function getValidDate($value, $format)
     {
-        $date = \DateTime::createFromFormat($format, $value);
+        $date = DateTime::createFromFormat($format, $value);
 
         if ($date !== false) {
-            $errors = \DateTime::getLastErrors();
+            $errors = DateTime::getLastErrors();
             if ($errors['error_count'] === 0 && $errors['warning_count'] === 0) {
                 $timestamp = $date->getTimestamp();
                 return $timestamp > 0 ? $timestamp : 0;
@@ -578,4 +579,40 @@ class Task extends Base
 
         return 0;
     }
+
+    /**
+     * Parse a date ad return a unix timestamp, try different date formats
+     *
+     * @access public
+     * @param  string   $value   Date to parse
+     * @return integer
+     */
+    public function parseDate($value)
+    {
+        foreach ($this->getDateFormats() as $format) {
+
+            $timestamp = $this->getValidDate($value, $format);
+
+            if ($timestamp !== 0) {
+                return $timestamp;
+            }
+        }
+
+        return null;
+    }
+
+    /**
+     * Return the list of supported date formats
+     *
+     * @access public
+     * @return array
+     */
+    public function getDateFormats()
+    {
+        return array(
+            t('m/d/Y'),
+            'Y-m-d',
+            'Y_m_d',
+        );
+    }
 }
diff --git a/templates/task_edit.php b/templates/task_edit.php
index 856f7d5d8..9fe0418fc 100644
--- a/templates/task_edit.php
+++ b/templates/task_edit.php
@@ -25,6 +25,7 @@
 
         <?= Helper\form_label(t('Due Date'), 'date_due') ?>
         <?= Helper\form_text('date_due', $values, $errors, array('placeholder="'.t('month/day/year').'"'), 'form-date') ?><br/>
+        <div class="form-help"><?= t('Others formats accepted: %s and %s', date('Y-m-d'), date('Y_m_d')) ?></div>
 
         <?= Helper\form_label(t('Description'), 'description') ?>
         <?= Helper\form_textarea('description', $values, $errors) ?><br/>
diff --git a/templates/task_new.php b/templates/task_new.php
index efb9cb622..f5797cdf4 100644
--- a/templates/task_new.php
+++ b/templates/task_new.php
@@ -24,6 +24,7 @@
 
         <?= Helper\form_label(t('Due Date'), 'date_due') ?>
         <?= Helper\form_text('date_due', $values, $errors, array('placeholder="'.t('month/day/year').'"'), 'form-date') ?><br/>
+        <div class="form-help"><?= t('Others formats accepted: %s and %s', date('Y-m-d'), date('Y_m_d')) ?></div>
 
         <?= Helper\form_label(t('Description'), 'description') ?>
         <?= Helper\form_textarea('description', $values, $errors) ?><br/>
diff --git a/tests/TaskTest.php b/tests/TaskTest.php
index 701ba6117..594d0e136 100644
--- a/tests/TaskTest.php
+++ b/tests/TaskTest.php
@@ -79,13 +79,19 @@ class TaskTest extends Base
     {
         $t = new Task($this->db, $this->event);
 
-        $this->assertEquals('2014-03-05', date('Y-m-d', $t->getTimestampFromDate('05/03/2014', 'd/m/Y')));
-        $this->assertEquals('2014-03-05', date('Y-m-d', $t->getTimestampFromDate('03/05/2014', 'm/d/Y')));
-        $this->assertEquals('2014-03-05', date('Y-m-d', $t->getTimestampFromDate('3/5/2014', 'm/d/Y')));
-        $this->assertEquals('2014-03-05', date('Y-m-d', $t->getTimestampFromDate('5/3/2014', 'd/m/Y')));
-        $this->assertEquals('2014-03-05', date('Y-m-d', $t->getTimestampFromDate('5/3/14', 'd/m/y')));
-        $this->assertEquals(0, $t->getTimestampFromDate('5/3/14', 'd/m/Y'));
-        $this->assertEquals(0, $t->getTimestampFromDate('5-3-2014', 'd/m/Y'));
+        $this->assertEquals('2014-03-05', date('Y-m-d', $t->getValidDate('2014-03-05', 'Y-m-d')));
+        $this->assertEquals('2014-03-05', date('Y-m-d', $t->getValidDate('2014_03_05', 'Y_m_d')));
+        $this->assertEquals('2014-03-05', date('Y-m-d', $t->getValidDate('05/03/2014', 'd/m/Y')));
+        $this->assertEquals('2014-03-05', date('Y-m-d', $t->getValidDate('03/05/2014', 'm/d/Y')));
+        $this->assertEquals('2014-03-05', date('Y-m-d', $t->getValidDate('3/5/2014', 'm/d/Y')));
+        $this->assertEquals('2014-03-05', date('Y-m-d', $t->getValidDate('5/3/2014', 'd/m/Y')));
+        $this->assertEquals('2014-03-05', date('Y-m-d', $t->getValidDate('5/3/14', 'd/m/y')));
+        $this->assertEquals(0, $t->getValidDate('5/3/14', 'd/m/Y'));
+        $this->assertEquals(0, $t->getValidDate('5-3-2014', 'd/m/Y'));
+
+        $this->assertEquals('2014-03-05', date('Y-m-d', $t->parseDate('2014-03-05')));
+        $this->assertEquals('2014-03-05', date('Y-m-d', $t->parseDate('2014_03_05')));
+        $this->assertEquals('2014-03-05', date('Y-m-d', $t->parseDate('03/05/2014')));
     }
 
     public function testDuplicateTask()
diff --git a/vendor/SimpleValidator/Validators/Date.php b/vendor/SimpleValidator/Validators/Date.php
index 36b59fbee..54c949b0f 100644
--- a/vendor/SimpleValidator/Validators/Date.php
+++ b/vendor/SimpleValidator/Validators/Date.php
@@ -3,26 +3,26 @@
 namespace SimpleValidator\Validators;
 
 use SimpleValidator\Base;
+use \DateTime;
 
 class Date extends Base
 {
-    private $format;
+    private $formats = array();
 
-    public function __construct($field, $error_message, $format)
+    public function __construct($field, $error_message, array $formats)
     {
         parent::__construct($field, $error_message);
-        $this->format = $format;
+        $this->formats = $formats;
     }
 
     public function execute(array $data)
     {
         if (isset($data[$this->field]) && $data[$this->field] !== '') {
 
-            $date = \DateTime::createFromFormat($this->format, $data[$this->field]);
-
-            if ($date !== false) {
-                $errors = \DateTime::getLastErrors();
-                return $errors['error_count'] === 0 && $errors['warning_count'] === 0;
+            foreach ($this->formats as $format) {
+                if ($this->isValidDate($data[$this->field], $format) === true) {
+                    return true;
+                }
             }
 
             return false;
@@ -30,4 +30,19 @@ class Date extends Base
 
         return true;
     }
+
+    public function isValidDate($value, $format)
+    {
+        $date = DateTime::createFromFormat($format, $value);
+
+        if ($date !== false) {
+            $errors = DateTime::getLastErrors();
+            if ($errors['error_count'] === 0 && $errors['warning_count'] === 0) {
+                $timestamp = $date->getTimestamp();
+                return $timestamp > 0 ? true : false;
+            }
+        }
+
+        return false;
+    }
 }