diff --git a/test/phpunit/DateLibTest.php b/test/phpunit/DateLibTest.php
index c40d9dabbfa..983ad2af489 100644
--- a/test/phpunit/DateLibTest.php
+++ b/test/phpunit/DateLibTest.php
@@ -367,6 +367,11 @@ class DateLibTest extends PHPUnit\Framework\TestCase
 		print __METHOD__." result=".$result."\n";
 		$this->assertEquals('1970-01-01 00:00:00', $result);
 
+		// Same with T and Z
+		$result=dol_print_date(0, '%Y-%m-%dT%H:%M:%SZ', true);
+		print __METHOD__." result=".$result."\n";
+		$this->assertEquals('1970-01-01T00:00:00Z', $result);
+
 		// Check %Y-%m-%d %H:%M:%S format
 		$result=dol_print_date(16725225600, '%Y-%m-%d %H:%M:%S', true);	// http://www.epochconverter.com/
 		print __METHOD__." result=".$result."\n";