diff --git a/adminstuds.php b/adminstuds.php
index 14a1798..d5f9cab 100644
--- a/adminstuds.php
+++ b/adminstuds.php
@@ -367,9 +367,9 @@ if (!empty($_GET['delete_column'])) {
         $slot->title = $ex[0];
         $slot->moment = $ex[1];
 
-        $result = $adminPollService->deleteDateSlot($poll_id, $slot);
+        $result = $adminPollService->deleteDateSlot($poll, $slot);
     } else {
-        $result = $adminPollService->deleteClassicSlot($poll_id, $column);
+        $result = $adminPollService->deleteClassicSlot($poll, $column);
     }
 
     if ($result) {
@@ -397,10 +397,10 @@ if (isset($_POST['confirm_add_slot'])) {
         $newmoment = strip_tags($_POST['newmoment']);
 
         $ex = explode('/', $newdate);
-        $result = $adminPollService->addSlot($poll_id, mktime(0, 0, 0, $ex[1], $ex[0], $ex[2]), $newmoment);
+        $result = $adminPollService->addDateSlot($poll_id, mktime(0, 0, 0, $ex[1], $ex[0], $ex[2]), $newmoment);
     } else {
         $newslot = strip_tags($_POST['choice']);
-        $result = $adminPollService->addSlot($poll_id, $newslot, null);
+        $result = $adminPollService->addClassicSlot($poll_id, $newslot);
     }
 
     if ($result) {
@@ -411,7 +411,7 @@ if (isset($_POST['confirm_add_slot'])) {
 }
 
 // Retrieve data
-$slots = $pollService->allSlotsByPollId($poll_id);
+$slots = $pollService->allSlotsByPoll($poll);
 $votes = $pollService->allVotesByPollId($poll_id);
 $comments = $pollService->allCommentsByPollId($poll_id);
 
diff --git a/app/classes/Framadate/Repositories/SlotRepository.php b/app/classes/Framadate/Repositories/SlotRepository.php
index fcd11c2..7d69e00 100644
--- a/app/classes/Framadate/Repositories/SlotRepository.php
+++ b/app/classes/Framadate/Repositories/SlotRepository.php
@@ -61,7 +61,7 @@ class SlotRepository extends AbstractRepository {
     }
 
     function listByPollId($poll_id) {
-        $prepared = $this->prepare('SELECT * FROM `' . Utils::table('slot') . '` WHERE poll_id = ? ORDER BY title');
+        $prepared = $this->prepare('SELECT * FROM `' . Utils::table('slot') . '` WHERE poll_id = ? ORDER BY id');
         $prepared->execute(array($poll_id));
 
         return $prepared->fetchAll();
diff --git a/app/classes/Framadate/Services/AdminPollService.php b/app/classes/Framadate/Services/AdminPollService.php
index 4760f8a..fb020bc 100644
--- a/app/classes/Framadate/Services/AdminPollService.php
+++ b/app/classes/Framadate/Services/AdminPollService.php
@@ -105,17 +105,17 @@ class AdminPollService {
     /**
      * Delete a slot from a poll.
      *
-     * @param $poll_id int The ID of the poll
-     * @param $slot object The slot informations (datetime + moment)
+     * @param object $poll The ID of the poll
+     * @param object $slot The slot informations (datetime + moment)
      * @return bool true if action succeeded
      */
-    public function deleteDateSlot($poll_id, $slot) {
-        $this->logService->log('DELETE_SLOT', 'id:' . $poll_id . ', slot:' . json_encode($slot));
+    public function deleteDateSlot($poll, $slot) {
+        $this->logService->log('DELETE_SLOT', 'id:' . $poll->id . ', slot:' . json_encode($slot));
 
         $datetime = $slot->title;
         $moment = $slot->moment;
 
-        $slots = $this->pollService->allSlotsByPollId($poll_id);
+        $slots = $this->pollService->allSlotsByPoll($poll);
 
         if (count($slots) === 1) {
             return false;
@@ -143,21 +143,21 @@ class AdminPollService {
 
         // Remove votes
         $this->connect->beginTransaction();
-        $this->voteRepository->deleteByIndex($poll_id, $indexToDelete);
+        $this->voteRepository->deleteByIndex($poll->id, $indexToDelete);
         if (count($newMoments) > 0) {
-            $this->slotRepository->update($poll_id, $datetime, implode(',', $newMoments));
+            $this->slotRepository->update($poll->id, $datetime, implode(',', $newMoments));
         } else {
-            $this->slotRepository->deleteByDateTime($poll_id, $datetime);
+            $this->slotRepository->deleteByDateTime($poll->id, $datetime);
         }
         $this->connect->commit();
 
         return true;
     }
 
-    public function deleteClassicSlot($poll_id, $slot_title) {
-        $this->logService->log('DELETE_SLOT', 'id:' . $poll_id . ', slot:' . $slot_title);
+    public function deleteClassicSlot($poll, $slot_title) {
+        $this->logService->log('DELETE_SLOT', 'id:' . $poll->id . ', slot:' . $slot_title);
 
-        $slots = $this->pollService->allSlotsByPollId($poll_id);
+        $slots = $this->pollService->allSlotsByPoll($poll);
 
         if (count($slots) === 1) {
             return false;
@@ -176,15 +176,15 @@ class AdminPollService {
 
         // Remove votes
         $this->connect->beginTransaction();
-        $this->voteRepository->deleteByIndex($poll_id, $indexToDelete);
-        $this->slotRepository->deleteByDateTime($poll_id, $slot_title);
+        $this->voteRepository->deleteByIndex($poll->id, $indexToDelete);
+        $this->slotRepository->deleteByDateTime($poll->id, $slot_title);
         $this->connect->commit();
 
         return true;
     }
 
     /**
-     * Add a new slot to the poll. And insert default values for user's votes.
+     * Add a new slot to a date poll. And insert default values for user's votes.
      * <ul>
      *  <li>Create a new slot if no one exists for the given date</li>
      *  <li>Create a new moment if a slot already exists for the given date</li>
@@ -195,7 +195,7 @@ class AdminPollService {
      * @param $new_moment string The moment's name
      * @return bool true if added
      */
-    public function addSlot($poll_id, $datetime, $new_moment) {
+    public function addDateSlot($poll_id, $datetime, $new_moment) {
         $slots = $this->slotRepository->listByPollId($poll_id);
         $result = $this->findInsertPosition($slots, $datetime, $new_moment);
 
@@ -232,6 +232,44 @@ class AdminPollService {
 
     }
 
+    /**
+     * Add a new slot to a classic poll. And insert default values for user's votes.
+     * <ul>
+     *  <li>Create a new slot if no one exists for the given title</li>
+     * </ul>
+     *
+     * @param $poll_id int The ID of the poll
+     * @param $title int The title
+     * @return bool true if added
+     */
+    public function addClassicSlot($poll_id, $title) {
+        $slots = $this->slotRepository->listByPollId($poll_id);
+
+        // Check if slot already exists
+        $titles = array_map(function ($slot) {
+            return $slot->title;
+        }, $slots);
+        if (in_array($title, $titles)) {
+            // The moment already exists
+            return false;
+        }
+
+
+        // Begin transaction
+        $this->connect->beginTransaction();
+
+        // New slot
+        $this->slotRepository->insert($poll_id, $title, null);
+        // Set default votes
+        $this->voteRepository->insertDefault($poll_id, count($slots));
+
+        // Commit transaction
+        $this->connect->commit();
+
+        return true;
+
+    }
+
     /**
      * This method find where to insert a datatime+moment into a list of slots.<br/>
      * Return the {insert:X}, where X is the index of the moment into the whole poll (ex: X=0 => Insert to the first column).
diff --git a/app/classes/Framadate/Services/PollService.php b/app/classes/Framadate/Services/PollService.php
index 7b99902..7ca2921 100644
--- a/app/classes/Framadate/Services/PollService.php
+++ b/app/classes/Framadate/Services/PollService.php
@@ -64,8 +64,16 @@ class PollService {
         return $this->voteRepository->allUserVotesByPollId($poll_id);
     }
 
-    function allSlotsByPollId($poll_id) {
-        return $this->slotRepository->listByPollId($poll_id);
+    function allSlotsByPoll($poll) {
+        $slots = $this->slotRepository->listByPollId($poll->id);
+        if ($poll->format == 'D') {
+            uasort($slots, function ($a, $b) {
+                return $a->title > $b->title;
+            });
+            return $slots;
+        } else {
+            return $slots;
+        }
     }
 
     public function updateVote($poll_id, $vote_id, $name, $choices) {
diff --git a/exportcsv.php b/exportcsv.php
index 6197cfb..15fd9cb 100644
--- a/exportcsv.php
+++ b/exportcsv.php
@@ -51,7 +51,7 @@ if (!$poll) {
 }
 
 
-$slots = $pollService->allSlotsByPollId($poll_id);
+$slots = $pollService->allSlotsByPoll($poll);
 $votes = $pollService->allVotesByPollId($poll_id);
 
 // CSV header
diff --git a/studs.php b/studs.php
index 9246943..7270fd1 100644
--- a/studs.php
+++ b/studs.php
@@ -197,7 +197,7 @@ if (isset($_POST['add_comment'])) {
 }
 
 // Retrieve data
-$slots = $pollService->allSlotsByPollId($poll_id);
+$slots = $pollService->allSlotsByPoll($poll);
 $votes = $pollService->allVotesByPollId($poll_id);
 $comments = $pollService->allCommentsByPollId($poll_id);