diff --git a/reference/forms/types/datetime.rst b/reference/forms/types/datetime.rst
index 8501adc3dfc..16c981991a3 100644
--- a/reference/forms/types/datetime.rst
+++ b/reference/forms/types/datetime.rst
@@ -83,7 +83,7 @@ as a series of ``select`` boxes. When the placeholder value is a string,
 it will be used as the **blank value** of all select boxes::
 
     use Symfony\Component\Form\Extension\Core\Type\DateTimeType;
-    
+
     $builder->add('startDateTime', DateTimeType::class, array(
         'placeholder' => 'Select a value',
     ));
@@ -92,7 +92,7 @@ Alternatively, you can use an array that configures different placeholder
 values for the year, month, day, hour, minute and second fields::
 
     use Symfony\Component\Form\Extension\Core\Type\DateTimeType;
-    
+
     $builder->add('startDateTime', DateTimeType::class, array(
         'placeholder' => array(
             'year' => 'Year', 'month' => 'Month', 'day' => 'Day',
@@ -125,6 +125,7 @@ on your underlying object. Valid values are:
 
 * ``string`` (e.g. ``2011-06-05 12:15:00``)
 * ``datetime`` (a ``DateTime`` object)
+* ``datetime_immutable`` (a ``DateTimeImmutable`` object)
 * ``array`` (e.g. ``array(2011, 06, 05, 12, 15, 0)``)
 * ``timestamp`` (e.g. ``1307276100``)
 
diff --git a/reference/forms/types/options/date_input.rst.inc b/reference/forms/types/options/date_input.rst.inc
index e1078d88b6b..51c53fac7ca 100644
--- a/reference/forms/types/options/date_input.rst.inc
+++ b/reference/forms/types/options/date_input.rst.inc
@@ -8,6 +8,7 @@ on your underlying object. Valid values are:
 
 * ``string`` (e.g. ``2011-06-05``)
 * ``datetime`` (a ``DateTime`` object)
+* ``datetime_immutable`` (a ``DateTimeImmutable`` object)
 * ``array`` (e.g. ``array('year' => 2011, 'month' => 06, 'day' => 05)``)
 * ``timestamp`` (e.g. ``1307232000``)
 
diff --git a/reference/forms/types/time.rst b/reference/forms/types/time.rst
index a2c539e26bd..e6b766f8b91 100644
--- a/reference/forms/types/time.rst
+++ b/reference/forms/types/time.rst
@@ -120,6 +120,7 @@ on your underlying object. Valid values are:
 
 * ``string`` (e.g. ``12:17:26``)
 * ``datetime`` (a ``DateTime`` object)
+* ``datetime_immutable`` (a ``DateTimeImmutable`` object)
 * ``array`` (e.g. ``array('hour' => 12, 'minute' => 17, 'second' => 26)``)
 * ``timestamp`` (e.g. ``1307232000``)