diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7dca1b4..b7444e4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 Common and useful classes, methods, exceptions etc.
 
+# 0.1.5
+
+1. Tests > Date > one more test case
+
 # 0.1.4
 
 1. Phing > update configuration
diff --git a/VERSION b/VERSION
index 845639e..9faa1b7 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-0.1.4
+0.1.5
diff --git a/tests/Utilities/DateTest.php b/tests/Utilities/DateTest.php
index bcf9cd6..94a7813 100644
--- a/tests/Utilities/DateTest.php
+++ b/tests/Utilities/DateTest.php
@@ -279,9 +279,18 @@ class DateTest extends BaseTestCase
         self::assertEquals(0, Date::getDateDifference($dateStart, $dateEnd, Date::DATE_DIFFERENCE_UNIT_YEARS));
         self::assertEquals(0, Date::getDateDifference(new DateTime($dateStart), new DateTime($dateEnd), Date::DATE_DIFFERENCE_UNIT_YEARS));
 
+        self::assertEquals(0, Date::getDateDifference($dateStart, $dateEnd, Date::DATE_DIFFERENCE_UNIT_MONTHS));
+        self::assertEquals(0, Date::getDateDifference(new DateTime($dateStart), new DateTime($dateEnd), Date::DATE_DIFFERENCE_UNIT_MONTHS));
+
         self::assertEquals(1, Date::getDateDifference($dateStart, $dateEnd, Date::DATE_DIFFERENCE_UNIT_DAYS));
         self::assertEquals(1, Date::getDateDifference(new DateTime($dateStart), new DateTime($dateEnd), Date::DATE_DIFFERENCE_UNIT_DAYS));
 
+        self::assertEquals(0, Date::getDateDifference($dateStart, $dateEnd, Date::DATE_DIFFERENCE_UNIT_HOURS));
+        self::assertEquals(0, Date::getDateDifference(new DateTime($dateStart), new DateTime($dateEnd), Date::DATE_DIFFERENCE_UNIT_HOURS));
+
+        self::assertEquals(0, Date::getDateDifference($dateStart, $dateEnd, Date::DATE_DIFFERENCE_UNIT_MINUTES));
+        self::assertEquals(0, Date::getDateDifference(new DateTime($dateStart), new DateTime($dateEnd), Date::DATE_DIFFERENCE_UNIT_MINUTES));
+
         /*
          * Difference of 1 day (using the relative date format)
          */
@@ -294,8 +303,10 @@ class DateTest extends BaseTestCase
         ];
 
         self::assertEquals($effect, Date::getDateDifference(new DateTime('yesterday'), new DateTime('midnight')));
+        self::assertEquals(0, Date::getDateDifference(new DateTime('yesterday'), new DateTime('midnight'), Date::DATE_DIFFERENCE_UNIT_MONTHS));
         self::assertEquals(1, Date::getDateDifference(new DateTime('yesterday'), new DateTime('midnight'), Date::DATE_DIFFERENCE_UNIT_DAYS));
         self::assertEquals(0, Date::getDateDifference(new DateTime('yesterday'), new DateTime('midnight'), Date::DATE_DIFFERENCE_UNIT_HOURS));
+        self::assertEquals(0, Date::getDateDifference(new DateTime('yesterday'), new DateTime('midnight'), Date::DATE_DIFFERENCE_UNIT_MINUTES));
     }
 
     public function testGetDateDifferenceOneDayTwoHours()
@@ -320,6 +331,12 @@ class DateTest extends BaseTestCase
         self::assertEquals(0, Date::getDateDifference($dateStart, $dateEnd, Date::DATE_DIFFERENCE_UNIT_YEARS));
         self::assertEquals(0, Date::getDateDifference(new DateTime($dateStart), new DateTime($dateEnd), Date::DATE_DIFFERENCE_UNIT_YEARS));
 
+        self::assertEquals(0, Date::getDateDifference($dateStart, $dateEnd, Date::DATE_DIFFERENCE_UNIT_MONTHS));
+        self::assertEquals(0, Date::getDateDifference(new DateTime($dateStart), new DateTime($dateEnd), Date::DATE_DIFFERENCE_UNIT_MONTHS));
+
+        self::assertEquals(1, Date::getDateDifference($dateStart, $dateEnd, Date::DATE_DIFFERENCE_UNIT_DAYS));
+        self::assertEquals(1, Date::getDateDifference(new DateTime($dateStart), new DateTime($dateEnd), Date::DATE_DIFFERENCE_UNIT_DAYS));
+
         self::assertEquals(2, Date::getDateDifference($dateStart, $dateEnd, Date::DATE_DIFFERENCE_UNIT_HOURS));
         self::assertEquals(2, Date::getDateDifference(new DateTime($dateStart), new DateTime($dateEnd), Date::DATE_DIFFERENCE_UNIT_HOURS));
 
@@ -355,10 +372,141 @@ class DateTest extends BaseTestCase
         self::assertEquals(41, Date::getDateDifference($dateStart, $dateEnd, Date::DATE_DIFFERENCE_UNIT_DAYS));
         self::assertEquals(41, Date::getDateDifference(new DateTime($dateStart), new DateTime($dateEnd), Date::DATE_DIFFERENCE_UNIT_DAYS));
 
+        self::assertEquals(4, Date::getDateDifference($dateStart, $dateEnd, Date::DATE_DIFFERENCE_UNIT_HOURS));
+        self::assertEquals(4, Date::getDateDifference(new DateTime($dateStart), new DateTime($dateEnd), Date::DATE_DIFFERENCE_UNIT_HOURS));
+
         self::assertEquals(30, Date::getDateDifference($dateStart, $dateEnd, Date::DATE_DIFFERENCE_UNIT_MINUTES));
         self::assertEquals(30, Date::getDateDifference(new DateTime($dateStart), new DateTime($dateEnd), Date::DATE_DIFFERENCE_UNIT_MINUTES));
     }
 
+    public function testGetDateDifferenceNewYear()
+    {
+        $dateStart = '2017-12-31 23:59';
+        $dateEnd = '2018-01-01 00:00';
+
+        $effect = [
+            Date::DATE_DIFFERENCE_UNIT_YEARS   => 0,
+            Date::DATE_DIFFERENCE_UNIT_MONTHS  => 0,
+            Date::DATE_DIFFERENCE_UNIT_DAYS    => 0,
+            Date::DATE_DIFFERENCE_UNIT_HOURS   => 0,
+            Date::DATE_DIFFERENCE_UNIT_MINUTES => 1,
+        ];
+
+        self::assertEquals($effect, Date::getDateDifference($dateStart, $dateEnd));
+        self::assertEquals($effect, Date::getDateDifference(new DateTime($dateStart), new DateTime($dateEnd)));
+
+        self::assertEquals(0, Date::getDateDifference($dateStart, $dateEnd, Date::DATE_DIFFERENCE_UNIT_YEARS));
+        self::assertEquals(0, Date::getDateDifference(new DateTime($dateStart), new DateTime($dateEnd), Date::DATE_DIFFERENCE_UNIT_YEARS));
+
+        self::assertEquals(0, Date::getDateDifference($dateStart, $dateEnd, Date::DATE_DIFFERENCE_UNIT_MONTHS));
+        self::assertEquals(0, Date::getDateDifference(new DateTime($dateStart), new DateTime($dateEnd), Date::DATE_DIFFERENCE_UNIT_MONTHS));
+
+        self::assertEquals(0, Date::getDateDifference($dateStart, $dateEnd, Date::DATE_DIFFERENCE_UNIT_DAYS));
+        self::assertEquals(0, Date::getDateDifference(new DateTime($dateStart), new DateTime($dateEnd), Date::DATE_DIFFERENCE_UNIT_DAYS));
+
+        self::assertEquals(0, Date::getDateDifference($dateStart, $dateEnd, Date::DATE_DIFFERENCE_UNIT_HOURS));
+        self::assertEquals(0, Date::getDateDifference(new DateTime($dateStart), new DateTime($dateEnd), Date::DATE_DIFFERENCE_UNIT_HOURS));
+
+        self::assertEquals(1, Date::getDateDifference($dateStart, $dateEnd, Date::DATE_DIFFERENCE_UNIT_MINUTES));
+        self::assertEquals(1, Date::getDateDifference(new DateTime($dateStart), new DateTime($dateEnd), Date::DATE_DIFFERENCE_UNIT_MINUTES));
+    }
+
+    public function testGetDateDifferenceLessThan24Hours()
+    {
+        $dateStart = '2017-01-01 16:00';
+        $dateEnd = '2017-01-02 10:00';
+
+        $effect = [
+            Date::DATE_DIFFERENCE_UNIT_YEARS   => 0,
+            Date::DATE_DIFFERENCE_UNIT_MONTHS  => 0,
+            Date::DATE_DIFFERENCE_UNIT_DAYS    => 0,
+            Date::DATE_DIFFERENCE_UNIT_HOURS   => 18,
+            Date::DATE_DIFFERENCE_UNIT_MINUTES => 0,
+        ];
+
+        self::assertEquals($effect, Date::getDateDifference($dateStart, $dateEnd));
+        self::assertEquals($effect, Date::getDateDifference(new DateTime($dateStart), new DateTime($dateEnd)));
+
+        self::assertEquals(0, Date::getDateDifference($dateStart, $dateEnd, Date::DATE_DIFFERENCE_UNIT_YEARS));
+        self::assertEquals(0, Date::getDateDifference(new DateTime($dateStart), new DateTime($dateEnd), Date::DATE_DIFFERENCE_UNIT_YEARS));
+
+        self::assertEquals(0, Date::getDateDifference($dateStart, $dateEnd, Date::DATE_DIFFERENCE_UNIT_MONTHS));
+        self::assertEquals(0, Date::getDateDifference(new DateTime($dateStart), new DateTime($dateEnd), Date::DATE_DIFFERENCE_UNIT_MONTHS));
+
+        self::assertEquals(0, Date::getDateDifference($dateStart, $dateEnd, Date::DATE_DIFFERENCE_UNIT_DAYS));
+        self::assertEquals(0, Date::getDateDifference(new DateTime($dateStart), new DateTime($dateEnd), Date::DATE_DIFFERENCE_UNIT_DAYS));
+
+        self::assertEquals(18, Date::getDateDifference($dateStart, $dateEnd, Date::DATE_DIFFERENCE_UNIT_HOURS));
+        self::assertEquals(18, Date::getDateDifference(new DateTime($dateStart), new DateTime($dateEnd), Date::DATE_DIFFERENCE_UNIT_HOURS));
+
+        self::assertEquals(0, Date::getDateDifference($dateStart, $dateEnd, Date::DATE_DIFFERENCE_UNIT_MINUTES));
+        self::assertEquals(0, Date::getDateDifference(new DateTime($dateStart), new DateTime($dateEnd), Date::DATE_DIFFERENCE_UNIT_MINUTES));
+    }
+
+    public function testGetDateDifferenceEqual24Hours()
+    {
+        $dateStart = '2017-01-01 00:00';
+        $dateEnd = '2017-01-02 00:00';
+
+        $effect = [
+            Date::DATE_DIFFERENCE_UNIT_YEARS   => 0,
+            Date::DATE_DIFFERENCE_UNIT_MONTHS  => 0,
+            Date::DATE_DIFFERENCE_UNIT_DAYS    => 1,
+            Date::DATE_DIFFERENCE_UNIT_HOURS   => 0,
+            Date::DATE_DIFFERENCE_UNIT_MINUTES => 0,
+        ];
+
+        self::assertEquals($effect, Date::getDateDifference($dateStart, $dateEnd));
+        self::assertEquals($effect, Date::getDateDifference(new DateTime($dateStart), new DateTime($dateEnd)));
+
+        self::assertEquals(0, Date::getDateDifference($dateStart, $dateEnd, Date::DATE_DIFFERENCE_UNIT_YEARS));
+        self::assertEquals(0, Date::getDateDifference(new DateTime($dateStart), new DateTime($dateEnd), Date::DATE_DIFFERENCE_UNIT_YEARS));
+
+        self::assertEquals(0, Date::getDateDifference($dateStart, $dateEnd, Date::DATE_DIFFERENCE_UNIT_MONTHS));
+        self::assertEquals(0, Date::getDateDifference(new DateTime($dateStart), new DateTime($dateEnd), Date::DATE_DIFFERENCE_UNIT_MONTHS));
+
+        self::assertEquals(1, Date::getDateDifference($dateStart, $dateEnd, Date::DATE_DIFFERENCE_UNIT_DAYS));
+        self::assertEquals(1, Date::getDateDifference(new DateTime($dateStart), new DateTime($dateEnd), Date::DATE_DIFFERENCE_UNIT_DAYS));
+
+        self::assertEquals(0, Date::getDateDifference($dateStart, $dateEnd, Date::DATE_DIFFERENCE_UNIT_HOURS));
+        self::assertEquals(0, Date::getDateDifference(new DateTime($dateStart), new DateTime($dateEnd), Date::DATE_DIFFERENCE_UNIT_HOURS));
+
+        self::assertEquals(0, Date::getDateDifference($dateStart, $dateEnd, Date::DATE_DIFFERENCE_UNIT_MINUTES));
+        self::assertEquals(0, Date::getDateDifference(new DateTime($dateStart), new DateTime($dateEnd), Date::DATE_DIFFERENCE_UNIT_MINUTES));
+    }
+
+    public function testGetDateDifferenceInvertedDates()
+    {
+        $dateStart = '2017-01-02 10:00';
+        $dateEnd = '2017-01-01 16:00';
+
+        $effect = [
+            Date::DATE_DIFFERENCE_UNIT_YEARS   => 0,
+            Date::DATE_DIFFERENCE_UNIT_MONTHS  => 0,
+            Date::DATE_DIFFERENCE_UNIT_DAYS    => -1,
+            Date::DATE_DIFFERENCE_UNIT_HOURS   => 6,
+            Date::DATE_DIFFERENCE_UNIT_MINUTES => 0,
+        ];
+
+        self::assertEquals($effect, Date::getDateDifference($dateStart, $dateEnd));
+        self::assertEquals($effect, Date::getDateDifference(new DateTime($dateStart), new DateTime($dateEnd)));
+
+        self::assertEquals(0, Date::getDateDifference($dateStart, $dateEnd, Date::DATE_DIFFERENCE_UNIT_YEARS));
+        self::assertEquals(0, Date::getDateDifference(new DateTime($dateStart), new DateTime($dateEnd), Date::DATE_DIFFERENCE_UNIT_YEARS));
+
+        self::assertEquals(0, Date::getDateDifference($dateStart, $dateEnd, Date::DATE_DIFFERENCE_UNIT_MONTHS));
+        self::assertEquals(0, Date::getDateDifference(new DateTime($dateStart), new DateTime($dateEnd), Date::DATE_DIFFERENCE_UNIT_MONTHS));
+
+        self::assertEquals(-1, Date::getDateDifference($dateStart, $dateEnd, Date::DATE_DIFFERENCE_UNIT_DAYS));
+        self::assertEquals(-1, Date::getDateDifference(new DateTime($dateStart), new DateTime($dateEnd), Date::DATE_DIFFERENCE_UNIT_DAYS));
+
+        self::assertEquals(6, Date::getDateDifference($dateStart, $dateEnd, Date::DATE_DIFFERENCE_UNIT_HOURS));
+        self::assertEquals(6, Date::getDateDifference(new DateTime($dateStart), new DateTime($dateEnd), Date::DATE_DIFFERENCE_UNIT_HOURS));
+
+        self::assertEquals(0, Date::getDateDifference($dateStart, $dateEnd, Date::DATE_DIFFERENCE_UNIT_MINUTES));
+        self::assertEquals(0, Date::getDateDifference(new DateTime($dateStart), new DateTime($dateEnd), Date::DATE_DIFFERENCE_UNIT_MINUTES));
+    }
+
     public function testGetDateDifferenceNoDifference()
     {
         /*
@@ -384,6 +532,12 @@ class DateTest extends BaseTestCase
         self::assertEquals(0, Date::getDateDifference($dateStart, $dateEnd, Date::DATE_DIFFERENCE_UNIT_MONTHS));
         self::assertEquals(0, Date::getDateDifference(new DateTime(), new DateTime(), Date::DATE_DIFFERENCE_UNIT_MONTHS));
 
+        self::assertEquals(0, Date::getDateDifference($dateStart, $dateEnd, Date::DATE_DIFFERENCE_UNIT_DAYS));
+        self::assertEquals(0, Date::getDateDifference(new DateTime(), new DateTime(), Date::DATE_DIFFERENCE_UNIT_DAYS));
+
+        self::assertEquals(0, Date::getDateDifference($dateStart, $dateEnd, Date::DATE_DIFFERENCE_UNIT_HOURS));
+        self::assertEquals(0, Date::getDateDifference(new DateTime(), new DateTime(), Date::DATE_DIFFERENCE_UNIT_HOURS));
+
         self::assertEquals(0, Date::getDateDifference($dateStart, $dateEnd, Date::DATE_DIFFERENCE_UNIT_MINUTES));
         self::assertEquals(0, Date::getDateDifference(new DateTime(), new DateTime(), Date::DATE_DIFFERENCE_UNIT_MINUTES));
     }