diff --git a/Theme/Backend/Components/Calendar/mini.tpl.php b/Theme/Backend/Components/Calendar/mini.tpl.php
index 1f9b117..b7d5ef8 100644
--- a/Theme/Backend/Components/Calendar/mini.tpl.php
+++ b/Theme/Backend/Components/Calendar/mini.tpl.php
@@ -16,9 +16,9 @@
             <li><?= $this->getHtml('Saturday', 'Calendar'); ?>
         </ul>
         <?php $current = $this->calendar->getDate()->getMonthCalendar(0); $isActiveMonth = false;
-        for ($i = 0; $i < 6; $i++) : ?>
+        for ($i = 0; $i < 6; ++$i) : ?>
         <ul class="days">
-            <?php for ($j = 0; $j < 7; $j++) :
+            <?php for ($j = 0; $j < 7; ++$j) :
                 $isActiveMonth = ((int) $current[$i*7+$j]->format('d') === 1) ? !$isActiveMonth : $isActiveMonth;
             ?>
                 <?php if ($isActiveMonth) :?>
diff --git a/Theme/Backend/calendar-dashboard.tpl.php b/Theme/Backend/calendar-dashboard.tpl.php
index 5c0efe3..6f25727 100644
--- a/Theme/Backend/calendar-dashboard.tpl.php
+++ b/Theme/Backend/calendar-dashboard.tpl.php
@@ -33,9 +33,9 @@ $calendar = $this->getData('calendar');
                     <li><?= $this->getHtml('Saturday'); ?>
                 </ul>
                 <?php $current = $calendar->getDate()->getMonthCalendar(0); $isActiveMonth = false;
-                for ($i = 0; $i < 6; $i++) : ?>
+                for ($i = 0; $i < 6; ++$i) : ?>
                 <ul class="days">
-                    <?php for ($j = 0; $j < 7; $j++) :
+                    <?php for ($j = 0; $j < 7; ++$j) :
                         $isActiveMonth = ((int) $current[$i*7+$j]->format('d') === 1) ? !$isActiveMonth : $isActiveMonth;
                     ?>
                         <?php if ($isActiveMonth) :?>