diff --git a/tests/codeigniter/helpers/date_helper_test.php b/tests/codeigniter/helpers/date_helper_test.php
index 2429351..1d397ac 100644
--- a/tests/codeigniter/helpers/date_helper_test.php
+++ b/tests/codeigniter/helpers/date_helper_test.php
@@ -51,7 +51,7 @@
 		$this->ci_set_config('time_reference', 'UTC');
 
 		$this->assertEquals(
-			gmmktime(date('H'), date('i'), date('s'), date('m'), date('d'), date('Y')),
+			gmmktime(date('G'), date('i'), date('s'), date('n'), date('j'), date('Y')),
 			now()
 		);
 	}
@@ -196,9 +196,9 @@
 	public function test_local_to_gmt()
 	{
 		$this->assertEquals(
-			mktime(
-				gmdate('H', $this->time), gmdate('i', $this->time), gmdate('s', $this->time),
-				gmdate('m', $this->time), gmdate('d', $this->time), gmdate('Y', $this->time)
+			gmmktime(
+				date('G', $this->time), date('i', $this->time), date('s', $this->time),
+				date('n', $this->time), date('j', $this->time), date('Y', $this->time)
 			),
 			local_to_gmt($this->time)
 		);