diff --git a/composer.json b/composer.json
index 3776e7d..24217a8 100644
--- a/composer.json
+++ b/composer.json
@@ -2,7 +2,7 @@
     "name": "meritoo/common-library",
     "description": "Useful classes, methods, extensions etc.",
     "license": "MIT",
-    "version": "0.0.3",
+    "version": "0.0.4",
     "authors": [
         {
             "name": "Meritoo.pl",
diff --git a/src/Meritoo/Common/Exception/Date/IncorrectDatePartException.php b/src/Meritoo/Common/Exception/Date/IncorrectDatePartException.php
deleted file mode 100644
index 7a68268..0000000
--- a/src/Meritoo/Common/Exception/Date/IncorrectDatePartException.php
+++ /dev/null
@@ -1,32 +0,0 @@
-<?php
-
-/**
- * (c) Meritoo.pl, http://www.meritoo.pl
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Meritoo\Common\Exception\Date;
-
-use Exception;
-
-/**
- * An exception used while given part of date is incorrect, e.g. value of year is incorrect
- *
- * @author    Krzysztof Niziol <krzysztof.niziol@meritoo.pl>
- * @copyright Meritoo.pl
- */
-class IncorrectDatePartException extends Exception
-{
-    /**
-     * Class constructor
-     *
-     * @param string $value    Incorrect value
-     * @param string $datePart Type of date part, e.g. "year". One of \Meritoo\Common\Type\DatePartType class constants.
-     */
-    public function __construct($value, $datePart)
-    {
-        $message = sprintf('Value of %s \'%s\' is incorrect. Is there everything ok?', $datePart, $value);
-        parent::__construct($message);
-    }
-}
diff --git a/src/Meritoo/Common/Exception/Date/UnknownDatePartTypeException.php b/src/Meritoo/Common/Exception/Date/UnknownDatePartTypeException.php
new file mode 100644
index 0000000..d25a610
--- /dev/null
+++ b/src/Meritoo/Common/Exception/Date/UnknownDatePartTypeException.php
@@ -0,0 +1,32 @@
+<?php
+
+/**
+ * (c) Meritoo.pl, http://www.meritoo.pl
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Meritoo\Common\Exception\Date;
+
+use Meritoo\Common\Exception\Base\UnknownTypeException;
+use Meritoo\Common\Type\DatePartType;
+
+/**
+ * An exception used while type of date part, e.g. "year", is unknown
+ *
+ * @author    Krzysztof Niziol <krzysztof.niziol@meritoo.pl>
+ * @copyright Meritoo.pl
+ */
+class UnknownDatePartTypeException extends UnknownTypeException
+{
+    /**
+     * Class constructor
+     *
+     * @param string $unknownDatePart Type of date part, e.g. "year". One of DatePartType class constants.
+     * @param string $value           Incorrect value
+     */
+    public function __construct($unknownDatePart, $value)
+    {
+        parent::__construct($unknownDatePart, new DatePartType(), sprintf('date part (with value %s)', $value));
+    }
+}
diff --git a/src/Meritoo/Common/Utilities/Date.php b/src/Meritoo/Common/Utilities/Date.php
index 1b59b39..9a0f500 100644
--- a/src/Meritoo/Common/Utilities/Date.php
+++ b/src/Meritoo/Common/Utilities/Date.php
@@ -10,7 +10,7 @@ namespace Meritoo\Common\Utilities;
 
 use DateInterval;
 use DateTime;
-use Meritoo\Common\Exception\Date\IncorrectDatePartException;
+use Meritoo\Common\Exception\Date\UnknownDatePartTypeException;
 use Meritoo\Common\Type\DatePartType;
 
 /**
@@ -231,7 +231,7 @@ class Date
      * @param int $day   The day value
      *
      * @return int
-     * @throws IncorrectDatePartException
+     * @throws UnknownDatePartTypeException
      */
     public static function getDayOfWeek($year, $month, $day)
     {
@@ -243,21 +243,21 @@ class Date
          * Oops, incorrect year
          */
         if ($year <= 0) {
-            throw new IncorrectDatePartException($year, DatePartType::YEAR);
+            throw new UnknownDatePartTypeException(DatePartType::YEAR, $year);
         }
 
         /*
          * Oops, incorrect month
          */
         if ($month < 1 || $month > 12) {
-            throw new IncorrectDatePartException($month, DatePartType::MONTH);
+            throw new UnknownDatePartTypeException(DatePartType::MONTH, $month);
         }
 
         /*
          * Oops, incorrect day
          */
         if ($day < 1 || $day > 31) {
-            throw new IncorrectDatePartException($day, DatePartType::DAY);
+            throw new UnknownDatePartTypeException(DatePartType::DAY, $day);
         }
 
         if ($month < 3) {
diff --git a/src/Meritoo/Common/Utilities/TestCase.php b/src/Meritoo/Common/Utilities/TestCase.php
index b0ec257..d161350 100644
--- a/src/Meritoo/Common/Utilities/TestCase.php
+++ b/src/Meritoo/Common/Utilities/TestCase.php
@@ -10,6 +10,7 @@ namespace Meritoo\Common\Utilities;
 
 use DateTime;
 use Generator;
+use PHPUnit_Framework_TestCase;
 
 /**
  * Test case with common methods and data providers
@@ -17,7 +18,7 @@ use Generator;
  * @author    Krzysztof Niziol <krzysztof.niziol@meritoo.pl>
  * @copyright Meritoo.pl
  */
-class TestCase extends \PHPUnit_Framework_TestCase
+class TestCase extends PHPUnit_Framework_TestCase
 {
     /**
      * Provides an empty value
diff --git a/tests/Meritoo/Common/Tests/Exception/Base/UnknownTypeExceptionTest.php b/tests/Meritoo/Common/Tests/Exception/Base/UnknownTypeExceptionTest.php
index 3f957f6..b3d9f76 100644
--- a/tests/Meritoo/Common/Tests/Exception/Base/UnknownTypeExceptionTest.php
+++ b/tests/Meritoo/Common/Tests/Exception/Base/UnknownTypeExceptionTest.php
@@ -10,6 +10,7 @@ namespace Meritoo\Common\Tests\Exception\Base;
 
 use Meritoo\Common\Exception\Base\UnknownTypeException;
 use Meritoo\Common\Type\Base\BaseType;
+use PHPUnit_Framework_TestCase;
 
 /**
  * Tests of the exception used while type of something is unknown
@@ -17,7 +18,7 @@ use Meritoo\Common\Type\Base\BaseType;
  * @author    Krzysztof Niziol <krzysztof.niziol@meritoo.pl>
  * @copyright Meritoo.pl
  */
-class UnknownTypeExceptionTest extends \PHPUnit_Framework_TestCase
+class UnknownTypeExceptionTest extends PHPUnit_Framework_TestCase
 {
     public function testWithoutException()
     {
diff --git a/tests/Meritoo/Common/Tests/Type/Base/BaseTypeTest.php b/tests/Meritoo/Common/Tests/Type/Base/BaseTypeTest.php
index 0575bbb..1275e88 100644
--- a/tests/Meritoo/Common/Tests/Type/Base/BaseTypeTest.php
+++ b/tests/Meritoo/Common/Tests/Type/Base/BaseTypeTest.php
@@ -10,6 +10,7 @@ namespace Meritoo\Common\Tests\Type\Base;
 
 use Generator;
 use Meritoo\Common\Type\Base\BaseType;
+use PHPUnit_Framework_TestCase;
 
 /**
  * Tests of the base / abstract type of something
@@ -17,7 +18,7 @@ use Meritoo\Common\Type\Base\BaseType;
  * @author    Krzysztof Niziol <krzysztof.niziol@meritoo.pl>
  * @copyright Meritoo.pl
  */
-class BaseTypeTest extends \PHPUnit_Framework_TestCase
+class BaseTypeTest extends PHPUnit_Framework_TestCase
 {
     /**
      * @param BaseType $type          Type of something
diff --git a/tests/Meritoo/Common/Tests/Type/DatePartTypeTest.php b/tests/Meritoo/Common/Tests/Type/DatePartTypeTest.php
index 99bb694..2bb5067 100644
--- a/tests/Meritoo/Common/Tests/Type/DatePartTypeTest.php
+++ b/tests/Meritoo/Common/Tests/Type/DatePartTypeTest.php
@@ -10,6 +10,7 @@ namespace Meritoo\Common\Tests\Type;
 
 use Generator;
 use Meritoo\Common\Type\DatePartType;
+use PHPUnit_Framework_TestCase;
 
 /**
  * Tests of the type of date part, e.g. "year"
@@ -17,7 +18,7 @@ use Meritoo\Common\Type\DatePartType;
  * @author    Krzysztof Niziol <krzysztof.niziol@meritoo.pl>
  * @copyright Meritoo.pl
  */
-class DatePartTypeTest extends \PHPUnit_Framework_TestCase
+class DatePartTypeTest extends PHPUnit_Framework_TestCase
 {
     public function testGetAll()
     {
diff --git a/tests/Meritoo/Common/Tests/Utilities/ArraysTest.php b/tests/Meritoo/Common/Tests/Utilities/ArraysTest.php
index 52efad9..bbeb855 100644
--- a/tests/Meritoo/Common/Tests/Utilities/ArraysTest.php
+++ b/tests/Meritoo/Common/Tests/Utilities/ArraysTest.php
@@ -9,6 +9,7 @@
 namespace Meritoo\Common\Tests\Utilities;
 
 use Meritoo\Common\Utilities\Arrays;
+use PHPUnit_Framework_TestCase;
 
 /**
  * Tests of the useful arrays methods
@@ -16,7 +17,7 @@ use Meritoo\Common\Utilities\Arrays;
  * @author    Krzysztof Niziol <krzysztof.niziol@meritoo.pl>
  * @copyright Meritoo.pl
  */
-class ArraysTest extends \PHPUnit_Framework_TestCase
+class ArraysTest extends PHPUnit_Framework_TestCase
 {
     private $simpleArray;
     private $simpleArrayWithKeys;
diff --git a/tests/Meritoo/Common/Tests/Utilities/BundleTest.php b/tests/Meritoo/Common/Tests/Utilities/BundleTest.php
index ec65954..3208c4a 100644
--- a/tests/Meritoo/Common/Tests/Utilities/BundleTest.php
+++ b/tests/Meritoo/Common/Tests/Utilities/BundleTest.php
@@ -9,6 +9,7 @@
 namespace Meritoo\Common\Tests\Utilities;
 
 use Meritoo\Common\Utilities\Bundle;
+use PHPUnit_Framework_TestCase;
 
 /**
  * Tests of the useful methods for bundle
@@ -16,7 +17,7 @@ use Meritoo\Common\Utilities\Bundle;
  * @author    Krzysztof Niziol <krzysztof.niziol@meritoo.pl>
  * @copyright Meritoo.pl
  */
-class BundleTest extends \PHPUnit_Framework_TestCase
+class BundleTest extends PHPUnit_Framework_TestCase
 {
     public function testGetBundleViewPathEmptyPathAndBundle()
     {
diff --git a/tests/Meritoo/Common/Tests/Utilities/DateTest.php b/tests/Meritoo/Common/Tests/Utilities/DateTest.php
index 841a6f9..d332cbc 100644
--- a/tests/Meritoo/Common/Tests/Utilities/DateTest.php
+++ b/tests/Meritoo/Common/Tests/Utilities/DateTest.php
@@ -11,7 +11,7 @@ namespace Meritoo\Common\Tests\Utilities;
 use DateInterval;
 use DateTime;
 use Generator;
-use Meritoo\Common\Exception\Date\IncorrectDatePartException;
+use Meritoo\Common\Exception\Date\UnknownDatePartTypeException;
 use Meritoo\Common\Utilities\Date;
 use Meritoo\Common\Utilities\TestCase;
 
@@ -218,7 +218,7 @@ class DateTest extends TestCase
      */
     public function testGetDayOfWeekIncorrectValues($year, $month, $day)
     {
-        $this->expectException(IncorrectDatePartException::class);
+        $this->expectException(UnknownDatePartTypeException::class);
         self::assertEmpty(Date::getDayOfWeek($year, $month, $day));
     }
 
diff --git a/tests/Meritoo/Common/Tests/Utilities/XmlTest.php b/tests/Meritoo/Common/Tests/Utilities/XmlTest.php
index 7faf5c1..f52bf1f 100644
--- a/tests/Meritoo/Common/Tests/Utilities/XmlTest.php
+++ b/tests/Meritoo/Common/Tests/Utilities/XmlTest.php
@@ -9,6 +9,7 @@
 namespace Meritoo\Common\Tests\Utilities;
 
 use Meritoo\Common\Utilities\Xml;
+use PHPUnit_Framework_TestCase;
 use SimpleXMLElement;
 
 /**
@@ -17,7 +18,7 @@ use SimpleXMLElement;
  * @author    Krzysztof Niziol <krzysztof.niziol@meritoo.pl>
  * @copyright Meritoo.pl
  */
-class XmlTest extends \PHPUnit_Framework_TestCase
+class XmlTest extends PHPUnit_Framework_TestCase
 {
     private $simpleXml;
     private $advancedXml;