diff --git a/adminstuds.php b/adminstuds.php
index f3f123d..66af6db 100644
--- a/adminstuds.php
+++ b/adminstuds.php
@@ -36,7 +36,7 @@ $editingVoteId = 0;
 /*----------*/
 
 $pollService = new PollService($connect);
-$adminPollService = new AdminPollService($connect);
+$adminPollService = new AdminPollService($connect, $pollService);
 $inputService = new InputService();
 
 /* PAGE */
@@ -115,7 +115,6 @@ if (isset($_POST['update_poll_info'])) {
 // -------------------------------
 
 if (!empty($_POST['edit_vote'])) {
-    // TODO Try what does filter_input with a wrong value
     $editingVoteId = filter_input(INPUT_POST, 'edit_vote', FILTER_VALIDATE_INT);
 }
 
@@ -170,6 +169,7 @@ if (!empty($_POST['save'])) { // Save edition of an old vote
 // -------------------------------
 // Delete a votes
 // -------------------------------
+
 if (!empty($_POST['delete_vote'])) {
     $vote_id = filter_input(INPUT_POST, 'delete_vote', FILTER_VALIDATE_INT);
     if ($adminPollService->deleteVote($poll_id, $vote_id)) {
@@ -182,6 +182,7 @@ if (!empty($_POST['delete_vote'])) {
 // -------------------------------
 // Remove all votes
 // -------------------------------
+
 if (isset($_POST['remove_all_votes'])) {
     $smarty->assign('poll_id', $poll_id);
     $smarty->assign('admin_poll_id', $admin_poll_id);
@@ -234,6 +235,7 @@ if (!empty($_POST['delete_comment'])) {
 // -------------------------------
 // Remove all comments
 // -------------------------------
+
 if (isset($_POST['remove_all_comments'])) {
     $smarty->assign('poll_id', $poll_id);
     $smarty->assign('admin_poll_id', $admin_poll_id);
@@ -264,6 +266,20 @@ if (isset($_POST['confirm_delete_poll'])) {
     // TODO
 }
 
+// -------------------------------
+// Delete a slot
+// -------------------------------
+
+if (!empty($_POST['delete_column'])) {
+    $column = filter_input(INPUT_POST, 'delete_column', FILTER_DEFAULT);
+
+    if ($adminPollService->deleteSlot($poll_id, $column)) {
+        $message = new Message('success', _('Column deleted.'));
+    } else {
+        $message = new Message('danger', _('Failed to delete the column.'));
+    }
+}
+
 // Retrieve data
 $slots = $pollService->allSlotsByPollId($poll_id);
 $votes = $pollService->allUserVotesByPollId($poll_id);
diff --git a/app/classes/Framadate/FramaDB.php b/app/classes/Framadate/FramaDB.php
index 102ccfb..0bbb036 100644
--- a/app/classes/Framadate/FramaDB.php
+++ b/app/classes/Framadate/FramaDB.php
@@ -18,23 +18,20 @@
  */
 namespace Framadate;
 
-class FramaDB
-{
+class FramaDB {
     /**
      * PDO Object, connection to database.
      */
     private $pdo = null;
 
-    function __construct($connection_string, $user, $password)
-    {
+    function __construct($connection_string, $user, $password) {
         $this->pdo = new \PDO($connection_string, $user, $password);
         $this->pdo->setAttribute(\PDO::ATTR_DEFAULT_FETCH_MODE, \PDO::FETCH_OBJ);
         $this->pdo->setAttribute(\PDO::ATTR_ERRMODE, \PDO::ERRMODE_EXCEPTION);
     }
 
-    function areTablesCreated()
-    {
-        $result= $this->pdo->query('SHOW TABLES');
+    function areTablesCreated() {
+        $result = $this->pdo->query('SHOW TABLES');
         $schemas = $result->fetchAll(\PDO::FETCH_COLUMN);
         return !empty(array_diff($schemas, ['comments', 'sondage', 'sujet_studs', 'user_studs']));
     }
@@ -118,6 +115,42 @@ class FramaDB
         return $prepared->execute([$poll_id]);
     }
 
+    /**
+     * Delete all votes made on given moment index.
+     *
+     * @param $poll_id int The ID of the poll
+     * @param $index int The index of the vote into the poll
+     * @return bool|null true if action succeeded.
+     */
+    function deleteVotesByIndex($poll_id, $index) {
+        $prepared = $this->prepare('UPDATE user_studs SET reponses = CONCAT(SUBSTR(reponses, 1, ?), SUBSTR(reponses, ?)) WHERE id_sondage = ?');
+        return $prepared->execute([$index, $index + 2, $poll_id]);
+    }
+
+    /**
+     * Update a slot into a poll.
+     *
+     * @param $poll_id int The ID of the poll
+     * @param $datetime int The datetime of the slot to update
+     * @param $newValue mixed The new value of the entire slot
+     * @return bool|null true if action succeeded.
+     */
+    function updateSlot($poll_id, $datetime, $newValue) {
+        $prepared = $this->prepare('UPDATE sujet_studs SET sujet = ? WHERE id_sondage = ? AND SUBSTRING_INDEX(sujet, \'@\', 1) = ?');
+        return $prepared->execute([$newValue, $poll_id, $datetime]);
+    }
+
+    /**
+     * Delete a entire slot from a poll.
+     *
+     * @param $poll_id int The ID of the poll
+     * @param $datetime mixed The datetime of the slot
+     */
+    function deleteSlot($poll_id, $datetime) {
+        $prepared = $this->prepare('DELETE FROM sujet_studs WHERE id_sondage = ? AND SUBSTRING_INDEX(sujet, \'@\', 1) = ?');
+        $prepared->execute([$poll_id, $datetime]);
+    }
+
     /**
      * Delete all comments of a given poll.
      *
diff --git a/app/classes/Framadate/Services/AdminPollService.php b/app/classes/Framadate/Services/AdminPollService.php
index eee80a9..450ed78 100644
--- a/app/classes/Framadate/Services/AdminPollService.php
+++ b/app/classes/Framadate/Services/AdminPollService.php
@@ -8,9 +8,11 @@ namespace Framadate\Services;
 class AdminPollService {
 
     private $connect;
+    private $pollService;
 
-    function __construct($connect) {
+    function __construct($connect, $pollService) {
         $this->connect = $connect;
+        $this->pollService = $pollService;
     }
 
     function updatePoll($poll) {
@@ -59,5 +61,50 @@ class AdminPollService {
         return $this->connect->deleteVotesByAdminPollId($poll_id);
     }
 
+    /**
+     * Delete a slot from a poll.
+     *
+     * @param $poll_id int The ID of the poll
+     * @param $slot string The name of the slot
+     */
+    public function deleteSlot($poll_id, $slot) {
+        $ex = explode('@', $slot);
+        $datetime = $ex[0];
+        $moment = $ex[1];
+
+        $slots = $this->pollService->allSlotsByPollId($poll_id);
+
+        $index = 0;
+        $indexToDelete = -1;
+        $newMoments = [];
+
+        // Search the index of the slot to delete
+        foreach ($slots as $aSlot) {
+            $ex = explode('@', $aSlot->sujet);
+            $moments = explode(',', $ex[1]);
+
+            foreach ($moments as $rowMoment) {
+                if ($datetime == $ex[0]) {
+                    if ($moment == $rowMoment) {
+                        $indexToDelete = $index;
+                    } else {
+                        $newMoments[] = $rowMoment;
+                    }
+                }
+                $index++;
+            }
+        }
+
+        // Remove votes
+        $this->connect->beginTransaction();
+        $this->connect->deleteVotesByIndex($poll_id, $indexToDelete);
+        if (count($newMoments) > 0) {
+            $this->connect->updateSlot($poll_id, $datetime, $datetime . '@' . implode(',', $newMoments));
+        } else {
+            $this->connect->deleteSlot($poll_id, $datetime);
+        }
+        $this->connect->commit();
+    }
+
 }
  
\ No newline at end of file
diff --git a/studs.php b/studs.php
index bf6db02..08a0206 100644
--- a/studs.php
+++ b/studs.php
@@ -55,7 +55,6 @@ if (!$poll) {
 // -------------------------------
 
 if (!empty($_POST['edit_vote'])) {
-    // TODO Try what does filter_input with a wrong value
     $editingVoteId = filter_input(INPUT_POST, 'edit_vote', FILTER_VALIDATE_INT);
 }