diff --git a/mod/assign/tests/locallib_test.php b/mod/assign/tests/locallib_test.php
index 1a203d291c7..bc364a72806 100644
--- a/mod/assign/tests/locallib_test.php
+++ b/mod/assign/tests/locallib_test.php
@@ -143,11 +143,12 @@ class mod_assign_locallib_testcase extends mod_assign_base_testcase {
         $this->assertContains(get_string('overdue', 'assign', format_time(4*24*60*60)), $output);
 
         // Grant an extension.
-        $assign->testable_save_user_extension($this->students[0]->id, time() + 2 * 24 * 60 * 60);
+        $extendedtime = time() + 2 * 24 * 60 * 60;
+        $assign->testable_save_user_extension($this->students[0]->id, $extendedtime);
         $gradingtable = new assign_grading_table($assign, 1, '', 0, true);
         $output = $assign->get_renderer()->render($gradingtable);
         $this->assertContains(get_string('submissionstatus_', 'assign'), $output);
-        $this->assertContains(get_string('userextensiondate', 'assign', userdate(time() + 2*24*60*60)), $output);
+        $this->assertContains(get_string('userextensiondate', 'assign', userdate($extendedtime)), $output);
 
         // Simulate a submission.
         $this->setUser($this->students[0]);
@@ -166,7 +167,7 @@ class mod_assign_locallib_testcase extends mod_assign_base_testcase {
         $gradingtable = new assign_grading_table($assign, 1, '', 0, true);
         $output = $assign->get_renderer()->render($gradingtable);
         $this->assertContains(get_string('submissionstatus_submitted', 'assign'), $output);
-        $this->assertContains(get_string('userextensiondate', 'assign', userdate(time() + 2*24*60*60)), $output);
+        $this->assertContains(get_string('userextensiondate', 'assign', userdate($extendedtime)), $output);
     }
 
     /**