diff --git a/composer.json b/composer.json
index a4262cb47b..eb687f231e 100644
--- a/composer.json
+++ b/composer.json
@@ -2,6 +2,7 @@
     "name": "shardj/zf1-future",
     "description": "Zend Framework 1. The aim is to keep ZF1 working with the latest PHP versions",
     "type": "library",
+    "version": "1.23.0",
     "keywords": [
         "framework",
         "zf1"
diff --git a/library/Zend/Date.php b/library/Zend/Date.php
index 5672efb0e2..6531519fd9 100644
--- a/library/Zend/Date.php
+++ b/library/Zend/Date.php
@@ -1918,6 +1918,22 @@ private function _calculate($calc, $date, $part, $locale)
 
             // date strings
             case self::ISO_8601:
+                
+                /////////////////////////////////////////////////
+                //first validate minimal lengts of given formats                
+                
+                // do we have enough of a date? minimum is Y-MM-dd
+                if( strpos($date, '-') !== FALSE && strlen($date) <9) {
+                    require_once 'Zend/Date/Exception.php';
+                    throw new Zend_Date_Exception("unsupported ISO8601 format ($date)", 0, null, $date);
+                }
+                
+                if( strpos($date, '-') === FALSE && strlen($date) <6) {
+                    require_once 'Zend/Date/Exception.php';
+                    throw new Zend_Date_Exception("unsupported ISO8601 format ($date)", 0, null, $date);
+                }
+                
+                
                 // (-)YYYY-MM-dd
                 preg_match('/^(-{0,1}\d{4})-(\d{2})-(\d{2})/', $date, $datematch);
                 // (-)YY-MM-dd
@@ -1954,10 +1970,10 @@ private function _calculate($calc, $date, $part, $locale)
                 if (empty($timematch)) {
                     preg_match('/[T,\s]{0,1}(\d{2})(\d{2})/', $tmpdate, $timematch);
                 }
-                if (empty($datematch) && empty($timematch)) {
-                    require_once 'Zend/Date/Exception.php';
-                    throw new Zend_Date_Exception("unsupported ISO8601 format ($date)", 0, null, $date);
-                }
+                    if (empty($datematch) && empty($timematch)) {
+                        require_once 'Zend/Date/Exception.php';
+                        throw new Zend_Date_Exception("unsupported ISO8601 format ($date)", 0, null, $date);
+                    }
                 if (!empty($timematch)) {
                     $timeMatchCharCount = iconv_strlen($timematch[0], 'UTF-8');
                     $tmpdate = iconv_substr($tmpdate,
diff --git a/library/Zend/Http/Client/Adapter/Test.php b/library/Zend/Http/Client/Adapter/Test.php
index 8392be3a7e..4e152c819c 100644
--- a/library/Zend/Http/Client/Adapter/Test.php
+++ b/library/Zend/Http/Client/Adapter/Test.php
@@ -127,7 +127,6 @@ public function setConfig($config = [])
      * @param string  $host
      * @param int     $port
      * @param boolean $secure
-     * @param int     $timeout
      * @throws Zend_Http_Client_Adapter_Exception
      */
     public function connect($host, $port = 80, $secure = false)
diff --git a/library/Zend/Validate/File/Extension.php b/library/Zend/Validate/File/Extension.php
index ed66d98a6b..ac00c84302 100644
--- a/library/Zend/Validate/File/Extension.php
+++ b/library/Zend/Validate/File/Extension.php
@@ -121,7 +121,7 @@ public function setCase($case)
      */
     public function getExtension()
     {
-        return $this->_extension !== null
+        return empty($this->_extension) === FALSE
             ? explode(',', $this->_extension)
             : [];
     }
@@ -134,7 +134,7 @@ public function getExtension()
      */
     public function setExtension($extension)
     {
-        $this->_extension = null;
+        $this->_extension = '';
         $this->addExtension($extension);
         return $this;
     }
diff --git a/library/Zend/Version.php b/library/Zend/Version.php
index 3a5ea83b33..b943955095 100644
--- a/library/Zend/Version.php
+++ b/library/Zend/Version.php
@@ -32,7 +32,7 @@ final class Zend_Version
     /**
      * Zend Framework version identification - see compareVersion()
      */
-    const VERSION = '1.22.0';
+    const VERSION = '1.23.0';
 
     /**
      * The latest stable version Zend Framework available
diff --git a/tests/Zend/VersionTest.php b/tests/Zend/VersionTest.php
index f88b4c368e..dd6188a585 100644
--- a/tests/Zend/VersionTest.php
+++ b/tests/Zend/VersionTest.php
@@ -59,7 +59,7 @@ public function testVersionCompare()
         $expect = -1;
         // unit test breaks if ZF version > 1.x
         for ($i = 0; $i <= 1; $i++) {
-            for ($j = 0; $j <= 22; $j++) {
+            for ($j = 0; $j <= 99; $j++) {
                 for ($k = 0; $k <= 99; $k++) {
                     foreach (['dev', 'pr', 'PR', 'alpha', 'a1', 'a2', 'beta', 'b1', 'b2', 'RC', 'RC1', 'RC2', 'RC3', '', 'pl1', 'PL1'] as $rel) {
                         $ver = "$i.$j.$k$rel";