diff --git a/cron/calendar_reminders.php b/cron/calendar_reminders.php
index c3937826..db0e5522 100644
--- a/cron/calendar_reminders.php
+++ b/cron/calendar_reminders.php
@@ -41,6 +41,10 @@ if ($hesk_settings['debug_mode']) {
  * 2 - days
  * 3 - weeks
  */
+$old_timeformat_setting = $hesklang['timeformat'];
+$hesk_settings['timeformat'] = 'Y-m-d H:i:s';
+$current_date = hesk_date();
+
 $case_statement = "CASE
       WHEN `unit` = '0' THEN DATE_SUB(`event`.`start`, INTERVAL `reminder`.`amount` MINUTE)
       WHEN `unit` = '1' THEN DATE_SUB(`event`.`start`, INTERVAL `reminder`.`amount` HOUR)
@@ -59,7 +63,7 @@ $sql = "SELECT `reminder`.`id` AS `reminder_id`, `reminder`.`user_id` AS `user_i
         ON `event`.`category` = `category`.`id`
     INNER JOIN `" . hesk_dbEscape($hesk_settings['db_pfix']) . "users` AS `user`
         ON `reminder`.`user_id` = `user`.`id`
-    WHERE (" . $case_statement . ") <= NOW()
+    WHERE (" . $case_statement . ") <= '{$current_date}'
     AND `email_sent` = '0'";
 
 $rs = hesk_dbQuery($sql);
@@ -129,7 +133,7 @@ $sql = "SELECT `ticket`.`id` AS `id`, `ticket`.`trackid` AS `trackid`, `ticket`.
     LEFT JOIN `" . hesk_dbEscape($hesk_settings['db_pfix']) . "users` AS `user`
         ON `ticket`.`owner` = `user`.`id`
     WHERE `due_date` IS NOT NULL
-        AND `due_date` <= NOW()
+        AND `due_date` <= '{$current_date}'
         AND `overdue_email_sent` = '0'";
 
 $successful_emails = 0;
@@ -182,4 +186,6 @@ if ($hesk_settings['debug_mode']) {
     $debug_msg = "Finished Overdue Tickets. {$successful_emails} e-mails sent. {$failed_emails} emails failed to send.\n";
     echo $debug_msg;
     mfh_log_debug($LOCATION, $debug_msg, 'CRON');
-}
\ No newline at end of file
+}
+
+$hesk_settings['timeformat'] = $old_timeformat_setting;
\ No newline at end of file
diff --git a/internal-api/dao/calendar_dao.php b/internal-api/dao/calendar_dao.php
index 549073df..571e2426 100644
--- a/internal-api/dao/calendar_dao.php
+++ b/internal-api/dao/calendar_dao.php
@@ -54,15 +54,21 @@ function get_events($start, $end, $hesk_settings, $staff = true) {
     }
 
     if ($staff) {
+        $old_time_setting = $hesk_settings['timeformat'];
+        $hesk_settings['timeformat'] = 'Y-m-d';
+        $current_date = hesk_date();
+        $hesk_settings['timeformat'] = $old_time_setting;
+
         $sql = "SELECT `trackid`, `subject`, `due_date`, `category`, `categories`.`name` AS `category_name`, `categories`.`color` AS `category_color`,
-          CASE WHEN `due_date` < CURDATE() THEN 1 ELSE 0 END AS `overdue`
+          CASE WHEN `due_date` < '{$current_date}' THEN 1 ELSE 0 END AS `overdue`
         FROM `" . hesk_dbEscape($hesk_settings['db_pfix']) . "tickets` AS `tickets`
         INNER JOIN `" . hesk_dbEscape($hesk_settings['db_pfix']) . "categories` AS `categories`
             ON `categories`.`id` = `tickets`.`category`
-            AND `categories`.`usage` <> 1
+            AND `categories`.`usage` <> 2
         WHERE `due_date` >= FROM_UNIXTIME(" . intval($start) . " / 1000)
         AND `due_date` <= FROM_UNIXTIME(" . intval($end) . " / 1000)
         AND `status` IN (SELECT `id` FROM `" . hesk_dbEscape($hesk_settings['db_pfix']) . "statuses` WHERE `IsClosed` = 0) ";
+        mfh_log_debug('Calendar', $sql, '');
 
         $rs = hesk_dbQuery($sql);
         while ($row = hesk_dbFetchAssoc($rs)) {