diff --git a/Adapter/AbstractAdapter.php b/Adapter/AbstractAdapter.php
index 571e2fb..9db6b2a 100644
--- a/Adapter/AbstractAdapter.php
+++ b/Adapter/AbstractAdapter.php
@@ -83,7 +83,7 @@ public static function factory($type = 'socket', $proxyConfig = null, $customNam
     {
         $obj = null;
         // Ensure the custom namespace ends with a \
-        $customNamespace = rtrim($customNamespace, '\\') .'\\';
+        $customNamespace = rtrim($customNamespace ?? '', '\\') .'\\';
         if ((strpos($type, '\\') !== false) && class_exists($type)) {
             $obj = new $type($proxyConfig);
         } elseif ((strlen($customNamespace) > 1) && class_exists($customNamespace . ucfirst($type))) {
diff --git a/Adapter/Socket.php b/Adapter/Socket.php
index 02af658..0f49481 100644
--- a/Adapter/Socket.php
+++ b/Adapter/Socket.php
@@ -238,7 +238,7 @@ private function connectToProxy(array $proxyConfig, array $config)
      */
     private function getProxyList()
     {
-        if (!strlen($this->proxyConfig)) {
+        if (!strlen($this->proxyConfig ?? '')) {
             return false;
         }
 
diff --git a/Config/Config.php b/Config/Config.php
index 20cdbf4..857cff7 100644
--- a/Config/Config.php
+++ b/Config/Config.php
@@ -73,7 +73,7 @@ public function __construct($specialWhois = array(), $customIni = null)
     {
         if (empty($this->config)) {
             $this->config = parse_ini_file('whois.ini');
-            if (strlen($customIni)) {
+            if (strlen($customIni ?? '')) {
                 $this->customConfig = parse_ini_file($customIni);
             }
         }
diff --git a/Parser.php b/Parser.php
index cef8ac8..629f145 100644
--- a/Parser.php
+++ b/Parser.php
@@ -118,7 +118,7 @@ class Parser
      * @var string
      * @access protected
      */
-    protected $dateformat = '%Y-%m-%d %H:%M:%S';
+    protected $dateformat = 'Y-m-d H:i:s';
 
     /**
      * Activate cache
@@ -272,7 +272,7 @@ private function prepare($query)
             if ($this->cachePath !== null) {
                 $Parser->setCachePath($this->cachePath);
             }
-            $this->Query = $Parser->parse(filter_var($query, FILTER_SANITIZE_STRING));
+            $this->Query = $Parser->parse(filter_var($query, FILTER_UNSAFE_RAW));
         }
     }
 
@@ -287,7 +287,7 @@ private function prepare($query)
     public function call($query = '')
     {
         if ($query != '') {
-            $this->Query = filter_var($query, FILTER_SANITIZE_STRING);
+            $this->Query = filter_var($query, FILTER_UNSAFE_RAW);
         }
         
         $Config = $this->Config->getCurrent();
@@ -471,7 +471,7 @@ public function getQuery()
      */
     public function setFormat($format = 'object')
     {
-        $this->format = filter_var($format, FILTER_SANITIZE_STRING);
+        $this->format = filter_var($format, FILTER_UNSAFE_RAW);
     }
 
     /**
@@ -483,7 +483,7 @@ public function setFormat($format = 'object')
      * @param  string $dateformat
      * @return void
      */
-    public function setDateFormat($dateformat = '%Y-%m-%d %H:%M:%S')
+    public function setDateFormat($dateformat = 'Y-m-d H:i:s')
     {
         $this->dateformat = $dateformat;
     }
diff --git a/Result/Result.php b/Result/Result.php
index a91ec7b..603b3cc 100644
--- a/Result/Result.php
+++ b/Result/Result.php
@@ -174,7 +174,7 @@ class Result extends AbstractResult
     /**
      * Name of the actual template
      *
-     * @var string
+     * @var string[]
      * @access protected
      */
     public $template;
@@ -533,7 +533,7 @@ public function cleanUp($config, $dateformat)
     /**
      * Format given dates by date format
      *
-     * @param  string $dateformat
+     * @param  string $dateformat
      * @param  string $date
      * @return string
      */
@@ -548,6 +548,12 @@ private function formatDate($dateformat, $date)
             $timestamp = strtotime(str_replace('/', '.', $date));
         }
 
-        return (strlen($timestamp) ? strftime($dateformat, $timestamp) : $date);
+        if ($timestamp !== false) {
+            $dt = new \DateTime();
+            $dt->setTimestamp($timestamp);
+            return $dt->format($dateformat);
+        }
+
+        return $date;
     }
 }
diff --git a/Templates/Type/AbstractTemplate.php b/Templates/Type/AbstractTemplate.php
index 7f53172..491a6b7 100644
--- a/Templates/Type/AbstractTemplate.php
+++ b/Templates/Type/AbstractTemplate.php
@@ -106,7 +106,7 @@ public static function factory($template, $customNamespace = null)
         $obj = null;
 
         // Ensure the custom namespace ends with a \
-        $customNamespace = rtrim($customNamespace, '\\') .'\\';
+        $customNamespace = rtrim($customNamespace ?? '', '\\') .'\\';
         if ((strpos($template, '\\') !== false) && class_exists($template, $customNamespace)) {
             $class = $template;
             $obj = new $class();
diff --git a/composer.json b/composer.json
index c76d1e5..9903b02 100644
--- a/composer.json
+++ b/composer.json
@@ -7,6 +7,7 @@
   , "author": "Novutec Inc."
   , "license": "Apache-2.0"
   , "require": {
+        "php": ">=7.4.0",
   		"novutec/domainparser": ">=2.0.3"
   	}
   , "autoload": {