diff --git a/tests/php-unit-tests/unitary-tests/core/ExpressionEvaluateTest.php b/tests/php-unit-tests/unitary-tests/core/ExpressionEvaluateTest.php
index 71428ab09..6c9733964 100644
--- a/tests/php-unit-tests/unitary-tests/core/ExpressionEvaluateTest.php
+++ b/tests/php-unit-tests/unitary-tests/core/ExpressionEvaluateTest.php
@@ -546,7 +546,7 @@ class ExpressionEvaluateTest extends iTopDataTestCase
 		$oDate = new DateTime($sStartDate);
 		for ($i = 0 ; $i < $iRepeat ; $i++)
 		{
-			$sDate = date_format($oDate, 'Y-m-d, H:i:s');
+			$sDate = date_format($oDate, 'Y-m-d H:i:s');
 			$this->debug("Checking '$sDate'");
 			$this->testEveryTimeFormat($sDate);
 			$oDate->add(new DateInterval($sInterval));