diff --git a/src/BackendBehaviors.php b/src/BackendBehaviors.php
index 8a3f96c..625f6d1 100644
--- a/src/BackendBehaviors.php
+++ b/src/BackendBehaviors.php
@@ -23,9 +23,19 @@ use dcPage;
 use dcPostsActions;
 use dcRecord;
 use dcSettings;
+use Dotclear\Helper\Html\Form\{
+    Checkbox,
+    Div,
+    Form,
+    Hidden,
+    Label,
+    Para,
+    Select,
+    Submit,
+    Text
+};
+use Dotclear\Helper\Html\Html;
 use Exception;
-use form;
-use html;
 
 /**
  * @ingroup DC_PLUGIN_PERIODICAL
@@ -46,24 +56,28 @@ class BackendBehaviors
         $s = $blog_settings->get('periodical');
 
         echo
-        '<div class="fieldset"><h4 id="periodical_params">' . __('Periodical') . '</h4>' .
-        '<div class="two-cols">' .
-        '<div class="col">' .
-        '<p><label class="classic" for="periodical_active">' .
-        form::checkbox('periodical_active', 1, (bool) $s->get('periodical_active')) .
-        __('Enable periodical on this blog') . '</label></p>' .
-        '</div>' .
-        '<div class="col">' .
-        '<p><label for="periodical_upddate">' .
-        form::checkbox('periodical_upddate', 1, (bool) $s->get('periodical_upddate')) .
-        __('Update post date when publishing it') . '</label></p>' .
-        '<p><label for="periodical_updurl">' .
-        form::checkbox('periodical_updurl', 1, (bool) $s->get('periodical_updurl')) .
-        __('Update post url when publishing it') . '</label></p>' .
-        '</div>' .
-        '</div>' .
-        '<br class="clear" />' .
-        '</div>';
+        (new Div())->class('fieldset')->items([
+            (new Text('h4', __('Periodical')))->id('periodical_params'),
+            (new Div())->class('two-cols')->items([
+                (new Div())->class('col')->items([
+                    (new Para())->items([
+                        (new Checkbox('periodical_active', (bool) $s->get('periodical_active')))->value(1),
+                        (new Label(__('Enable periodical on this blog'), Label::OUTSIDE_LABEL_AFTER))->for('periodical_active')->class('classic'),
+                    ]),
+                ]),
+                (new Div())->class('col')->items([
+                    (new Para())->items([
+                        (new Checkbox('periodical_upddate', (bool) $s->get('periodical_upddate')))->value(1),
+                        (new Label(__('Update post date when publishing it'), Label::OUTSIDE_LABEL_AFTER))->for('periodical_upddate')->class('classic'),
+                    ]),
+                    (new Para())->items([
+                        (new Checkbox('periodical_updurl', (bool) $s->get('periodical_updurl')))->value(1),
+                        (new Label(__('Update post url when publishing it'), Label::OUTSIDE_LABEL_AFTER))->for('periodical_updurl')->class('classic'),
+                    ]),
+                ]),
+            ]),
+            (new Text('br'))->class('clear'),
+        ])->render();
     }
 
     /**
@@ -145,7 +159,7 @@ class BackendBehaviors
             $name = '-';
         } else {
             $url  = dcCore::app()->adminurl->get('admin.plugin.periodical', ['part' => 'period', 'period_id' => $r->f('periodical_id')]);
-            $name = '<a href="' . $url . '#period" title="' . __('edit period') . '">' . html::escapeHTML($r->f('periodical_title')) . '</a>';
+            $name = '<a href="' . $url . '#period" title="' . __('edit period') . '">' . Html::escapeHTML($r->f('periodical_title')) . '</a>';
         }
         $cols['period'] = '<td class="nowrap">' . $name . '</td>';
     }
@@ -274,24 +288,25 @@ class BackendBehaviors
         else {
             $pa->beginPage(
                 dcPage::breadcrumb([
-                    html::escapeHTML(dcCore::app()->blog->name) => '',
+                    Html::escapeHTML(dcCore::app()->blog->name) => '',
                     $pa->getCallerTitle()                       => $pa->getRedirection(true),
                     __('Add a period to this selection')        => '',
                 ])
             );
 
             echo
-            '<form action="' . $pa->getURI() . '" method="post">' .
-            $pa->getCheckboxes() .
-
-            self::formPeriod() .
-
-            '<p>' .
-            dcCore::app()->formNonce() .
-            $pa->getHiddenFields() .
-            form::hidden(['action'], 'periodical_add') .
-            '<input type="submit" value="' . __('Save') . '" /></p>' .
-            '</form>';
+            (new Form('periodicaladd'))->method('post')->action($pa->getURI())->fields([
+                (new Text('', $pa->getCheckboxes())),
+                self::formPeriod(0),
+                (new Para())->items(array_merge(
+                    [
+                        dcCore::app()->formNonce(false),
+                        (new Hidden(['action'], 'periodical_add')),
+                        (new Submit(['do']))->value(__('Save')),
+                    ],
+                    $pa->hiddenFields()
+                )),
+            ])->render();
 
             $pa->endPage();
         }
@@ -314,7 +329,7 @@ class BackendBehaviors
         }
 
         # Set linked period form items
-        $sidebar_items['options-box']['items']['period'] = self::formPeriod((int) $period);
+        $sidebar_items['options-box']['items']['period'] = (string) self::formPeriod((int) $period)?->render();
     }
 
     /**
@@ -340,21 +355,16 @@ class BackendBehaviors
      * Posts period form field
      *
      * @param  int      $period Period
-     * @return string           Period form content
+     * @return null|Para     Period form object
      */
-    private static function formPeriod(int $period = 0): string
+    private static function formPeriod(int $period = 0): ?Para
     {
         $combo = self::comboPeriod();
 
-        if (empty($combo)) {
-            return '';
-        }
-
-        return
-        '<p><label for="periodical">' .
-        __('Periodical') . '</label>' .
-        form::combo('periodical', $combo, $period) .
-        '</p>';
+        return empty($combo) ? null : (new Para())->items([
+            (new Label(__('Period:')))->for('periodical'),
+            (new Select('periodical'))->default((string) $period)->items($combo),
+        ]);
     }
 
     /**
@@ -370,7 +380,7 @@ class BackendBehaviors
             if (!$periods->isEmpty()) {
                 $combo = ['-' => ''];
                 while ($periods->fetch()) {
-                    $combo[html::escapeHTML($periods->f('periodical_title'))] = $periods->f('periodical_id');
+                    $combo[Html::escapeHTML($periods->f('periodical_title'))] = $periods->f('periodical_id');
                 }
                 self::$combo_period = $combo;
             }
diff --git a/src/Manage.php b/src/Manage.php
index 6f83be8..536f2d1 100644
--- a/src/Manage.php
+++ b/src/Manage.php
@@ -19,9 +19,12 @@ use dcAuth;
 use dcCore;
 use dcNsProcess;
 use dcPage;
+use Dotclear\Helper\Html\Form\{
+    Hidden,
+    Select
+};
+use Dotclear\Helper\Network\Http;
 use Exception;
-use form;
-use http;
 
 /**
  * Admin page for periods
@@ -71,7 +74,7 @@ class Manage extends dcNsProcess
                 );
 
                 if (!empty($vars->redir)) {
-                    http::redirect($vars->redir);
+                    Http::redirect($vars->redir);
                 } else {
                     dcCore::app()->adminurl->redirect('admin.plugin.' . My::id(), ['part' => 'periods']);
                 }
@@ -92,7 +95,7 @@ class Manage extends dcNsProcess
                 );
 
                 if (!empty($vars->redir)) {
-                    http::redirect($vars->redir);
+                    Http::redirect($vars->redir);
                 } else {
                     dcCore::app()->adminurl->redirect('admin.plugin.' . My::id(), ['part' => 'periods']);
                 }
@@ -153,7 +156,7 @@ class Manage extends dcNsProcess
 
         if (isset($period_list)) {
             # Filters
-            $p_filter->display('admin.plugin.' . My::id(), form::hidden('p', My::id()) . form::hidden('part', 'periods'));
+            $p_filter->display('admin.plugin.' . My::id(), (new Hidden('p', My::id()))->render() . (new Hidden('part', 'periods'))->render());
 
             # Periods list
             $period_list->periodDisplay(
@@ -166,7 +169,7 @@ class Manage extends dcNsProcess
                 '<p class="col checkboxes-helpers"></p>' .
 
                 '<p class="col right">' . __('Selected periods action:') . ' ' .
-                form::combo('action', My::periodsActionCombo()) .
+                (new Select('action'))->items(My::periodsActionCombo())->render() .
                 '<input type="submit" value="' . __('ok') . '" /></p>' .
                 dcCore::app()->adminurl->getHiddenFormFields('admin.plugin.' . My::id(), array_merge(['p' => My::id()], $p_filter->values(true))) .
                 dcCore::app()->formNonce() .
diff --git a/src/ManageList.php b/src/ManageList.php
index 8bd7492..2ab6bdf 100644
--- a/src/ManageList.php
+++ b/src/ManageList.php
@@ -22,9 +22,9 @@ use dcAuth;
 use dcBlog;
 use dcCore;
 use dcPager;
+use Dotclear\Helper\Html\Form\Checkbox;
+use Dotclear\Helper\Html\Html;
 use dt;
-use html;
-use form;
 
 /**
  * @ingroup DC_PLUGIN_PERIODICAL
@@ -90,7 +90,7 @@ class ManageList extends adminGenericList
         $nb_posts = Utils::getPosts(['periodical_id' => $this->rs->f('periodical_id')], true)->f(0);
         $url      = dcCore::app()->adminurl->get('admin.plugin.periodical', ['part' => 'period', 'period_id' => $this->rs->f('periodical_id')]);
 
-        $name = '<a href="' . $url . '#period" title="' . __('edit period') . '">' . html::escapeHTML($this->rs->periodical_title) . '</a>';
+        $name = '<a href="' . $url . '#period" title="' . __('edit period') . '">' . Html::escapeHTML($this->rs->periodical_title) . '</a>';
 
         $posts = $nb_posts ?
             '<a href="' . $url . '#posts" title="' . __('view related entries') . '">' . $nb_posts . '</a>' :
@@ -100,7 +100,7 @@ class ManageList extends adminGenericList
             __((string) array_search($this->rs->f('periodical_pub_int'), My::periodCombo())) : __('Unknow frequence');
 
         $cols = new ArrayObject([
-            'check'   => '<td class="nowrap">' . form::checkbox(['periods[]'], $this->rs->f('periodical_id'), ['checked' => $checked]) . '</td>',
+            'check'   => '<td class="nowrap">' . (new Checkbox(['periods[]'], $checked))->value($this->rs->f('periodical_id'))->render() . '</td>',
             'name'    => '<td class="maximal">' . $name . '</td>',
             'curdt'   => '<td class="nowrap count">' . dt::dt2str(__('%Y-%m-%d %H:%M'), $this->rs->f('periodical_curdt'), dcCore::app()->auth->getInfo('user_tz')) . '</td>',
             'pub_int' => '<td class="nowrap">' . $interval . '</td>',
@@ -191,7 +191,7 @@ class ManageList extends adminGenericList
             $cat_title = sprintf(
                 $cat_link,
                 $this->rs->f('cat_id'),
-                html::escapeHTML($this->rs->f('cat_title'))
+                Html::escapeHTML($this->rs->f('cat_title'))
             );
         } else {
             $cat_title = __('None');
@@ -239,9 +239,9 @@ class ManageList extends adminGenericList
         }
 
         $cols = [
-            'check' => '<td class="minimal">' . form::checkbox(['periodical_entries[]'], $this->rs->f('post_id'), ['checked' => $checked]) . '</td>',
+            'check' => '<td class="minimal">' . (new Checkbox(['periodical_entries[]'], $checked))->value($this->rs->f('post_id'))->render() . '</td>',
             'title' => '<td class="maximal"><a href="' . dcCore::app()->getPostAdminURL($this->rs->f('post_type'), $this->rs->f('post_id')) . '" ' .
-                'title="' . html::escapeHTML($this->rs->getURL()) . '">' . html::escapeHTML($this->rs->post_title) . '</a></td>',
+                'title="' . Html::escapeHTML($this->rs->getURL()) . '">' . Html::escapeHTML($this->rs->post_title) . '</a></td>',
             'date'     => '<td class="nowrap">' . dt::dt2str(__('%Y-%m-%d %H:%M'), $this->rs->f('post_dt')) . '</td>',
             'category' => '<td class="nowrap">' . $cat_title . '</td>',
             'author'   => '<td class="nowrap">' . $this->rs->f('user_id') . '</td>',
diff --git a/src/ManagePeriod.php b/src/ManagePeriod.php
index 260abe1..76f98a6 100644
--- a/src/ManagePeriod.php
+++ b/src/ManagePeriod.php
@@ -19,10 +19,22 @@ use dcAuth;
 use dcCore;
 use dcNsProcess;
 use dcPage;
+use Dotclear\Helper\Html\Form\{
+    Datetime,
+    Div,
+    Form,
+    Hidden,
+    Input,
+    Label,
+    Number,
+    Para,
+    Select,
+    Submit,
+    Text
+};
+use Dotclear\Helper\Html\Html;
+use Dotclear\Helper\Network\Http;
 use Exception;
-use form;
-use html;
-use http;
 
 /**
  * Admin page for a period
@@ -205,47 +217,46 @@ class ManagePeriod extends dcNsProcess
         dcPage::notices();
 
         # Period form
-        echo '
-        <div id="period"><h3>' . (null === $vars->period_id ? __('New period') : __('Edit period')) . '</h3>
-        <form method="post" action="' . dcCore::app()->admin->getPageURL() . '">
+        echo
+        (new Div('period'))->items([
+            (new Text('h3', null === $vars->period_id ? __('New period') : __('Edit period'))),
+            (new Form('periodicalbhv'))->method('post')->action(dcCore::app()->admin->getPageURL())->fields([
+                (new Para())->items([
+                    (new Label(__('Title:')))->for('period_title'),
+                    (new Input('period_title'))->size(65)->maxlenght(255)->class('maximal')->value(Html::escapeHTML($vars->period_title)),
+                ]),
+                (new Div())->class('two-boxes')->items([
+                    (new Para())->items([
+                        (new Label(__('Next update:')))->for('period_curdt'),
+                        (new Datetime('period_curdt', Html::escapeHTML(Dater::toUser($vars->period_curdt))))->class($vars->bad_period_curdt ? 'invalid' : ''),
+                    ]),
+                    (new Para())->items([
+                        (new Label(__('End date:')))->for('period_enddt'),
+                        (new Datetime('period_enddt', Html::escapeHTML(Dater::toUser($vars->period_enddt))))->class($vars->bad_period_enddt ? 'invalid' : ''),
+                    ]),
+                ]),
+                (new Div())->class('two-boxes')->items([
+                    (new Para())->items([
+                        (new Label(__('Publication frequency:'), Label::OUTSIDE_LABEL_BEFORE))->for('period_pub_int'),
+                        (new Select('period_pub_int'))->default($vars->period_pub_int)->items(My::periodCombo()),
+                    ]),
+                    (new Para())->items([
+                        (new Label(__('Number of entries to publish every time:'), Label::OUTSIDE_LABEL_BEFORE))->for('period_pub_nb'),
+                        (new Number('period_pub_nb'))->min(1)->max(20)->value($vars->period_pub_nb),
+                    ]),
+                ]),
 
-        <p><label for="period_title">' . __('Title:') . '</label>' .
-                form::field('period_title', 60, 255, html::escapeHTML($vars->period_title), 'maximal') . '</p>
-
-        <div class="two-boxes">
-
-        <p><label for="period_curdt">' . __('Next update:') . '</label>' .
-                form::datetime('period_curdt', [
-                    'default' => html::escapeHTML(Dater::toUser($vars->period_curdt)),
-                    'class'   => ($vars->bad_period_curdt ? 'invalid' : ''),
-                ]) . '</p>
-
-        <p><label for="period_enddt">' . __('End date:') . '</label>' .
-                form::datetime('period_enddt', [
-                    'default' => html::escapeHTML(Dater::toUser($vars->period_enddt)),
-                    'class'   => ($vars->bad_period_enddt ? 'invalid' : ''),
-                ]) . '</p>
-
-        </div><div class="two-boxes">
-
-        <p><label for="period_pub_int">' . __('Publication frequency:') . '</label>' .
-                form::combo('period_pub_int', My::periodCombo(), $vars->period_pub_int) . '</p>
-
-        <p><label for="period_pub_nb">' . __('Number of entries to publish every time:') . '</label>' .
-                form::number('period_pub_nb', ['min' => 1, 'max' => 20, 'default' => $vars->period_pub_nb]) . '</p>
-
-        </div>
-
-        <div class="clear">
-        <p><input type="submit" name="save" value="' . __('Save') . '" />' .
-                dcCore::app()->formNonce() .
-                form::hidden(['action'], 'setperiod') .
-                form::hidden(['period_id'], $vars->period_id) .
-                form::hidden(['part'], 'period') . '
-        </p>
-        </div>
-        </form>
-        </div>';
+                (new Div())->class('clear')->items([
+                    (new Para())->items([
+                        (new Submit(['save']))->value(__('Save')),
+                        dcCore::app()->formNonce(false),
+                        (new Hidden(['action'], 'setperiod')),
+                        (new Hidden(['period_id'], (string) $vars->period_id)),
+                        (new Hidden(['part'], 'period')),
+                    ]),
+                ]),
+            ]),
+        ])->render();
 
         if ($vars->period_id && isset($post_filter) && isset($post_list) && !dcCore::app()->error->flag()) {
             $base_url = dcCore::app()->admin->getPageURL() .
@@ -288,7 +299,7 @@ class ManagePeriod extends dcNsProcess
                 '<p class="col checkboxes-helpers"></p>' .
 
                 '<p class="col right">' . __('Selected entries action:') . ' ' .
-                form::combo('action', My::entriesActionsCombo()) .
+                (new Select('action'))->items(My::entriesActionsCombo())->redner() .
                 '<input type="submit" value="' . __('ok') . '" /></p>' .
                 dcCore::app()->adminurl->getHiddenFormFields('admin.plugin.periodical', array_merge($post_filter->values(), [
                     'period_id' => $vars->period_id,
@@ -313,7 +324,7 @@ class ManagePeriod extends dcNsProcess
         dcPage::addSuccessNotice($msg);
 
         if (!empty($redir)) {
-            http::redirect($redir);
+            Http::redirect($redir);
         } else {
             dcCore::app()->adminurl->redirect('admin.plugin.' . My::id(), ['part' => 'period', 'period_id' => $id], $tab);
         }
diff --git a/src/Utils.php b/src/Utils.php
index 4bedb1f..8fa5c77 100644
--- a/src/Utils.php
+++ b/src/Utils.php
@@ -20,9 +20,9 @@ use dcBlog;
 use dcCore;
 use dcMeta;
 use dcRecord;
+use Dotclear\Helper\File\Files;
+use Dotclear\Helper\File\Path;
 use Exception;
-use files;
-use path;
 
 /**
  * Manage records
@@ -363,13 +363,13 @@ class Utils
                 $f_md5
             );
             # Real path
-            $cached_file = path::real($cached_file, false);
+            $cached_file = Path::real($cached_file, false);
             if (is_bool($cached_file)) {
                 throw new Exception("Can't write in cache fodler");
             }
             # Make dir
             if (!is_dir(dirname($cached_file))) {
-                files::makeDir(dirname($cached_file), true);
+                Files::makeDir(dirname($cached_file), true);
             }
             # Make file
             if (!file_exists($cached_file)) {