diff --git a/course/reset_form.php b/course/reset_form.php
index 4c649079743..33229576d14 100644
--- a/course/reset_form.php
+++ b/course/reset_form.php
@@ -186,7 +186,7 @@ class course_reset_form extends moodleform {
             $coursedata['enddate'] = $data['reset_end_date'];
         } else if ($data['reset_start_date'] > 0 && $course->enddate != 0) {
             // Otherwise, if the current course enddate is set, reset_course_userdata will add the start date time shift to it.
-            $timeshift = $data['reset_start_date'] - usergetmidnight($course->startdate);
+            $timeshift = $data['reset_start_date'] - $course->startdate;
             $coursedata['enddate'] = $course->enddate + $timeshift;
         } else {
             $coursedata['enddate'] = $course->enddate;
diff --git a/course/tests/courselib_test.php b/course/tests/courselib_test.php
index 729a81913fb..8303ef6da09 100644
--- a/course/tests/courselib_test.php
+++ b/course/tests/courselib_test.php
@@ -3696,7 +3696,16 @@ final class courselib_test extends advanced_testcase {
                 $time + YEARSECS,
                 $time + WEEKSECS,
                 $time + YEARSECS
-            ]
+            ],
+            // Time shift is between exact times, not midnight(s) (MDL-65233).
+            [
+                $time + HOURSECS,
+                $time + DAYSECS,
+                $time + WEEKSECS + HOURSECS,
+                false,
+                $time + WEEKSECS + HOURSECS,
+                $time + WEEKSECS + DAYSECS,
+            ],
         ];
     }
 
diff --git a/lib/moodlelib.php b/lib/moodlelib.php
index 70992a93302..73c4ce0d6da 100644
--- a/lib/moodlelib.php
+++ b/lib/moodlelib.php
@@ -5060,8 +5060,7 @@ function reset_course_userdata($data) {
 
     // Calculate the time shift of dates.
     if (!empty($data->reset_start_date)) {
-        // Time part of course startdate should be zero.
-        $data->timeshift = $data->reset_start_date - usergetmidnight($data->reset_start_date_old);
+        $data->timeshift = $data->reset_start_date - $data->reset_start_date_old;
     } else {
         $data->timeshift = 0;
     }