diff --git a/src/Symfony/Bridge/Twig/Resources/views/Form/form_div_layout.html.twig b/src/Symfony/Bridge/Twig/Resources/views/Form/form_div_layout.html.twig
index 0a5cd42cfda41..ff8faad141cff 100644
--- a/src/Symfony/Bridge/Twig/Resources/views/Form/form_div_layout.html.twig
+++ b/src/Symfony/Bridge/Twig/Resources/views/Form/form_div_layout.html.twig
@@ -255,6 +255,17 @@
     {{ block('form_widget_simple') }}
 {%- endblock color_widget -%}
 
+{%- block week_widget -%}
+    {%- if widget == 'single_text' -%}
+        {{ block('form_widget_simple') }}
+    {%- else -%}
+        {%- set vars = widget == 'text' ? { 'attr': { 'size': 1 }} : {} -%}
+        <div {{ block('widget_container_attributes') }}>
+            {{ form_widget(form.year, vars) }}-{{ form_widget(form.week, vars) }}
+        </div>
+    {%- endif -%}
+{%- endblock week_widget -%}
+
 {# Labels #}
 
 {%- block form_label -%}
diff --git a/src/Symfony/Bridge/Twig/Tests/Extension/AbstractBootstrap3LayoutTest.php b/src/Symfony/Bridge/Twig/Tests/Extension/AbstractBootstrap3LayoutTest.php
index d7868b274b753..6fb468b9dd7ce 100644
--- a/src/Symfony/Bridge/Twig/Tests/Extension/AbstractBootstrap3LayoutTest.php
+++ b/src/Symfony/Bridge/Twig/Tests/Extension/AbstractBootstrap3LayoutTest.php
@@ -2722,6 +2722,104 @@ public function testColor()
     [@name="name"]
     [@class="my&class form-control"]
     [@value="#0000ff"]
+'
+        );
+    }
+
+    public function testWeekSingleText()
+    {
+        $this->requiresFeatureSet(404);
+
+        $form = $this->factory->createNamed('holidays', 'Symfony\Component\Form\Extension\Core\Type\WeekType', '1970-W01', [
+            'input' => 'string',
+            'widget' => 'single_text',
+        ]);
+
+        $this->assertWidgetMatchesXpath($form->createView(), ['attr' => ['class' => 'my&class']],
+            '/input
+    [@type="week"]
+    [@name="holidays"]
+    [@class="my&class form-control"]
+    [@value="1970-W01"]
+    [not(@maxlength)]
+'
+        );
+    }
+
+    public function testWeekSingleTextNoHtml5()
+    {
+        $this->requiresFeatureSet(404);
+
+        $form = $this->factory->createNamed('holidays', 'Symfony\Component\Form\Extension\Core\Type\WeekType', '1970-W01', [
+            'input' => 'string',
+            'widget' => 'single_text',
+            'html5' => false,
+        ]);
+
+        $this->assertWidgetMatchesXpath($form->createView(), ['attr' => ['class' => 'my&class']],
+            '/input
+    [@type="text"]
+    [@name="holidays"]
+    [@class="my&class form-control"]
+    [@value="1970-W01"]
+    [not(@maxlength)]
+'
+        );
+    }
+
+    public function testWeekChoices()
+    {
+        $this->requiresFeatureSet(404);
+
+        $data = ['year' => date('Y'), 'week' => 1];
+
+        $form = $this->factory->createNamed('name', 'Symfony\Component\Form\Extension\Core\Type\WeekType', $data, [
+            'input' => 'array',
+            'required' => false,
+        ]);
+
+        $this->assertWidgetMatchesXpath($form->createView(), ['attr' => ['class' => 'my&class']],
+            '/div
+    [@class="my&class"]
+    [
+        ./select
+            [@id="name_year"]
+            [@class="form-control"]
+            [./option[@value="'.$data['year'].'"][@selected="selected"]]
+        /following-sibling::select
+            [@id="name_week"]
+            [@class="form-control"]
+            [./option[@value="'.$data['week'].'"][@selected="selected"]]
+    ]
+    [count(.//select)=2]'
+        );
+    }
+
+    public function testWeekText()
+    {
+        $this->requiresFeatureSet(404);
+
+        $form = $this->factory->createNamed('name', 'Symfony\Component\Form\Extension\Core\Type\WeekType', '2000-W01', [
+            'input' => 'string',
+            'widget' => 'text',
+        ]);
+
+        $this->assertWidgetMatchesXpath($form->createView(), ['attr' => ['class' => 'my&class']],
+            '/div
+    [@class="my&class"]
+    [
+        ./input
+            [@id="name_year"]
+            [@type="number"]
+            [@class="form-control"]
+            [@value="2000"]
+        /following-sibling::input
+            [@id="name_week"]
+            [@type="number"]
+            [@class="form-control"]
+            [@value="1"]
+    ]
+    [count(./input)=2]
 '
         );
     }
diff --git a/src/Symfony/Bundle/FrameworkBundle/Resources/views/Form/week_widget.html.php b/src/Symfony/Bundle/FrameworkBundle/Resources/views/Form/week_widget.html.php
new file mode 100644
index 0000000000000..610b6e0c19eac
--- /dev/null
+++ b/src/Symfony/Bundle/FrameworkBundle/Resources/views/Form/week_widget.html.php
@@ -0,0 +1,14 @@
+<?php if ($widget == 'single_text'): ?>
+    <?php echo $view['form']->block($form, 'form_widget_simple'); ?>
+<?php else: ?>
+    <?php $vars = $widget == 'text' ? ['attr' => ['size' => 1]] : [] ?>
+    <div <?php echo $view['form']->block($form, 'widget_container_attributes') ?>>
+        <?php
+            // There should be no spaces between the colons and the widgets, that's why
+            // this block is written in a single PHP tag
+            echo $view['form']->widget($form['year'], $vars);
+            echo '-';
+            echo $view['form']->widget($form['week'], $vars);
+        ?>
+    </div>
+<?php endif ?>
diff --git a/src/Symfony/Component/Form/CHANGELOG.md b/src/Symfony/Component/Form/CHANGELOG.md
index ba3fb1d226afb..99e7078f0f820 100644
--- a/src/Symfony/Component/Form/CHANGELOG.md
+++ b/src/Symfony/Component/Form/CHANGELOG.md
@@ -4,6 +4,7 @@ CHANGELOG
 4.4.0
 -----
 
+ * add new `WeekType`
  * using different values for the "model_timezone" and "view_timezone" options of the `TimeType` without configuring a
    reference date is deprecated
  * preferred choices are repeated in the list of all choices
diff --git a/src/Symfony/Component/Form/Extension/Core/CoreExtension.php b/src/Symfony/Component/Form/Extension/Core/CoreExtension.php
index b658b9979f64c..1f3431cb49ea7 100644
--- a/src/Symfony/Component/Form/Extension/Core/CoreExtension.php
+++ b/src/Symfony/Component/Form/Extension/Core/CoreExtension.php
@@ -83,6 +83,7 @@ protected function loadTypes()
             new Type\CurrencyType(),
             new Type\TelType(),
             new Type\ColorType(),
+            new Type\WeekType(),
         ];
     }
 
diff --git a/src/Symfony/Component/Form/Extension/Core/DataTransformer/WeekToArrayTransformer.php b/src/Symfony/Component/Form/Extension/Core/DataTransformer/WeekToArrayTransformer.php
new file mode 100644
index 0000000000000..51475e235c15a
--- /dev/null
+++ b/src/Symfony/Component/Form/Extension/Core/DataTransformer/WeekToArrayTransformer.php
@@ -0,0 +1,105 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Form\Extension\Core\DataTransformer;
+
+use Symfony\Component\Form\DataTransformerInterface;
+use Symfony\Component\Form\Exception\TransformationFailedException;
+
+/**
+ * Transforms between an ISO 8601 week date string and an array.
+ *
+ * @author Damien Fayet <damienf1521@gmail.com>
+ */
+class WeekToArrayTransformer implements DataTransformerInterface
+{
+    /**
+     * Transforms a string containing an ISO 8601 week date into an array.
+     *
+     * @param string|null $value A week date string
+     *
+     * @return array A value containing year and week
+     *
+     * @throws TransformationFailedException If the given value is not a string,
+     *                                       or if the given value does not follow the right format
+     */
+    public function transform($value)
+    {
+        if (null === $value) {
+            return ['year' => null, 'week' => null];
+        }
+
+        if (!\is_string($value)) {
+            throw new TransformationFailedException(sprintf('Value is expected to be a string but was "%s".', \is_object($value) ? \get_class($value) : \gettype($value)));
+        }
+
+        if (0 === preg_match('/^(?P<year>\d{4})-W(?P<week>\d{2})$/', $value, $matches)) {
+            throw new TransformationFailedException('Given data does not follow the date format "Y-\WW".');
+        }
+
+        return [
+            'year' => (int) $matches['year'],
+            'week' => (int) $matches['week'],
+        ];
+    }
+
+    /**
+     * Transforms an array into a week date string.
+     *
+     * @param array $value An array containing a year and a week number
+     *
+     * @return string|null A week date string following the format Y-\WW
+     *
+     * @throws TransformationFailedException If the given value can not be merged in a valid week date string,
+     *                                       or if the obtained week date does not exists
+     */
+    public function reverseTransform($value)
+    {
+        if (null === $value || [] === $value) {
+            return null;
+        }
+
+        if (!\is_array($value)) {
+            throw new TransformationFailedException(sprintf('Value is expected to be an array, but was "%s".', \is_object($value) ? \get_class($value) : \gettype($value)));
+        }
+
+        if (!\array_key_exists('year', $value)) {
+            throw new TransformationFailedException('Key "year" is missing.');
+        }
+
+        if (!\array_key_exists('week', $value)) {
+            throw new TransformationFailedException('Key "week" is missing.');
+        }
+
+        if ($additionalKeys = array_diff(array_keys($value), ['year', 'week'])) {
+            throw new TransformationFailedException(sprintf('Expected only keys "year" and "week" to be present, but also got ["%s"].', implode('", "', $additionalKeys)));
+        }
+
+        if (null === $value['year'] && null === $value['week']) {
+            return null;
+        }
+
+        if (!\is_int($value['year'])) {
+            throw new TransformationFailedException(sprintf('Year is expected to be an integer, but was "%s".', \is_object($value['year']) ? \get_class($value['year']) : \gettype($value['year'])));
+        }
+
+        if (!\is_int($value['week'])) {
+            throw new TransformationFailedException(sprintf('Week is expected to be an integer, but was "%s".', \is_object($value['week']) ? \get_class($value['week']) : \gettype($value['week'])));
+        }
+
+        // The 28th December is always in the last week of the year
+        if (date('W', strtotime('28th December '.$value['year'])) < $value['week']) {
+            throw new TransformationFailedException(sprintf('Week "%d" does not exist for year "%d".', $value['week'], $value['year']));
+        }
+
+        return sprintf('%d-W%02d', $value['year'], $value['week']);
+    }
+}
diff --git a/src/Symfony/Component/Form/Extension/Core/Type/WeekType.php b/src/Symfony/Component/Form/Extension/Core/Type/WeekType.php
new file mode 100644
index 0000000000000..70e0000ad9912
--- /dev/null
+++ b/src/Symfony/Component/Form/Extension/Core/Type/WeekType.php
@@ -0,0 +1,192 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Form\Extension\Core\Type;
+
+use Symfony\Component\Form\AbstractType;
+use Symfony\Component\Form\Exception\LogicException;
+use Symfony\Component\Form\Extension\Core\DataTransformer\WeekToArrayTransformer;
+use Symfony\Component\Form\FormBuilderInterface;
+use Symfony\Component\Form\FormInterface;
+use Symfony\Component\Form\FormView;
+use Symfony\Component\Form\ReversedTransformer;
+use Symfony\Component\OptionsResolver\Options;
+use Symfony\Component\OptionsResolver\OptionsResolver;
+
+class WeekType extends AbstractType
+{
+    private static $widgets = [
+        'text' => IntegerType::class,
+        'choice' => ChoiceType::class,
+    ];
+
+    /**
+     * {@inheritdoc}
+     */
+    public function buildForm(FormBuilderInterface $builder, array $options)
+    {
+        if ('string' === $options['input']) {
+            $builder->addModelTransformer(new WeekToArrayTransformer());
+        }
+
+        if ('single_text' === $options['widget']) {
+            $builder->addViewTransformer(new ReversedTransformer(new WeekToArrayTransformer()));
+        } else {
+            $yearOptions = $weekOptions = [
+                'error_bubbling' => true,
+                'empty_data' => '',
+            ];
+            // when the form is compound the entries of the array are ignored in favor of children data
+            // so we need to handle the cascade setting here
+            $emptyData = $builder->getEmptyData() ?: [];
+
+            $yearOptions['empty_data'] = $emptyData['year'] ?? '';
+            $weekOptions['empty_data'] = $emptyData['week'] ?? '';
+
+            if (isset($options['invalid_message'])) {
+                $yearOptions['invalid_message'] = $options['invalid_message'];
+                $weekOptions['invalid_message'] = $options['invalid_message'];
+            }
+
+            if (isset($options['invalid_message_parameters'])) {
+                $yearOptions['invalid_message_parameters'] = $options['invalid_message_parameters'];
+                $weekOptions['invalid_message_parameters'] = $options['invalid_message_parameters'];
+            }
+
+            if ('choice' === $options['widget']) {
+                // Only pass a subset of the options to children
+                $yearOptions['choices'] = array_combine($options['years'], $options['years']);
+                $yearOptions['placeholder'] = $options['placeholder']['year'];
+                $yearOptions['choice_translation_domain'] = $options['choice_translation_domain']['year'];
+
+                $weekOptions['choices'] = array_combine($options['weeks'], $options['weeks']);
+                $weekOptions['placeholder'] = $options['placeholder']['week'];
+                $weekOptions['choice_translation_domain'] = $options['choice_translation_domain']['week'];
+
+                // Append generic carry-along options
+                foreach (['required', 'translation_domain'] as $passOpt) {
+                    $yearOptions[$passOpt] = $options[$passOpt];
+                    $weekOptions[$passOpt] = $options[$passOpt];
+                }
+            }
+
+            $builder->add('year', self::$widgets[$options['widget']], $yearOptions);
+            $builder->add('week', self::$widgets[$options['widget']], $weekOptions);
+        }
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function buildView(FormView $view, FormInterface $form, array $options)
+    {
+        $view->vars['widget'] = $options['widget'];
+
+        if ($options['html5']) {
+            $view->vars['type'] = 'week';
+        }
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function configureOptions(OptionsResolver $resolver)
+    {
+        $compound = function (Options $options) {
+            return 'single_text' !== $options['widget'];
+        };
+
+        $placeholderDefault = function (Options $options) {
+            return $options['required'] ? null : '';
+        };
+
+        $placeholderNormalizer = function (Options $options, $placeholder) use ($placeholderDefault) {
+            if (\is_array($placeholder)) {
+                $default = $placeholderDefault($options);
+
+                return array_merge(
+                    ['year' => $default, 'week' => $default],
+                    $placeholder
+                );
+            }
+
+            return [
+                'year' => $placeholder,
+                'week' => $placeholder,
+            ];
+        };
+
+        $choiceTranslationDomainNormalizer = function (Options $options, $choiceTranslationDomain) {
+            if (\is_array($choiceTranslationDomain)) {
+                $default = false;
+
+                return array_replace(
+                    ['year' => $default, 'week' => $default],
+                    $choiceTranslationDomain
+                );
+            }
+
+            return [
+                'year' => $choiceTranslationDomain,
+                'week' => $choiceTranslationDomain,
+            ];
+        };
+
+        $resolver->setDefaults([
+            'years' => range(date('Y') - 10, date('Y') + 10),
+            'weeks' => array_combine(range(1, 53), range(1, 53)),
+            'widget' => 'single_text',
+            'input' => 'array',
+            'placeholder' => $placeholderDefault,
+            'html5' => static function (Options $options) {
+                return 'single_text' === $options['widget'];
+            },
+            'error_bubbling' => false,
+            'empty_data' => function (Options $options) {
+                return $options['compound'] ? [] : '';
+            },
+            'compound' => $compound,
+            'choice_translation_domain' => false,
+        ]);
+
+        $resolver->setNormalizer('placeholder', $placeholderNormalizer);
+        $resolver->setNormalizer('choice_translation_domain', $choiceTranslationDomainNormalizer);
+        $resolver->setNormalizer('html5', function (Options $options, $html5) {
+            if ($html5 && 'single_text' !== $options['widget']) {
+                throw new LogicException(sprintf('The "widget" option of %s must be set to "single_text" when the "html5" option is enabled.', self::class));
+            }
+
+            return $html5;
+        });
+
+        $resolver->setAllowedValues('input', [
+            'string',
+            'array',
+        ]);
+
+        $resolver->setAllowedValues('widget', [
+            'single_text',
+            'text',
+            'choice',
+        ]);
+
+        $resolver->setAllowedTypes('years', 'int[]');
+        $resolver->setAllowedTypes('weeks', 'int[]');
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getBlockPrefix()
+    {
+        return 'week';
+    }
+}
diff --git a/src/Symfony/Component/Form/Tests/AbstractLayoutTest.php b/src/Symfony/Component/Form/Tests/AbstractLayoutTest.php
index 8f1231e3bc293..c565894ccc513 100644
--- a/src/Symfony/Component/Form/Tests/AbstractLayoutTest.php
+++ b/src/Symfony/Component/Form/Tests/AbstractLayoutTest.php
@@ -2765,4 +2765,87 @@ public function submitFormNoValidateProvider()
             [true],
         ];
     }
+
+    public function testWeekSingleText()
+    {
+        $form = $this->factory->createNamed('holidays', 'Symfony\Component\Form\Extension\Core\Type\WeekType', '1970-W01', [
+            'input' => 'string',
+            'widget' => 'single_text',
+        ]);
+
+        $this->assertWidgetMatchesXpath($form->createView(), ['attr' => ['class' => 'my&class']],
+            '/input
+    [@type="week"]
+    [@name="holidays"]
+    [@class="my&class"]
+    [@value="1970-W01"]
+'
+        );
+    }
+
+    public function testWeekSingleTextNoHtml5()
+    {
+        $form = $this->factory->createNamed('holidays', 'Symfony\Component\Form\Extension\Core\Type\WeekType', '1970-W01', [
+            'input' => 'string',
+            'widget' => 'single_text',
+            'html5' => false,
+        ]);
+
+        $this->assertWidgetMatchesXpath($form->createView(), ['attr' => ['class' => 'my&class']],
+            '/input
+    [@type="text"]
+    [@name="holidays"]
+    [@class="my&class"]
+    [@value="1970-W01"]
+'
+        );
+    }
+
+    public function testWeekChoices()
+    {
+        $data = ['year' => date('Y'), 'week' => 1];
+
+        $form = $this->factory->createNamed('name', 'Symfony\Component\Form\Extension\Core\Type\WeekType', $data, [
+            'input' => 'array',
+            'required' => false,
+        ]);
+
+        $this->assertWidgetMatchesXpath($form->createView(), ['attr' => ['class' => 'my&class']],
+            '/div
+    [@class="my&class"]
+    [
+        ./select
+            [@id="name_year"]
+            [./option[@value="'.$data['year'].'"][@selected="selected"]]
+        /following-sibling::select
+            [@id="name_week"]
+            [./option[@value="'.$data['week'].'"][@selected="selected"]]
+    ]
+    [count(.//select)=2]'
+        );
+    }
+
+    public function testWeekText()
+    {
+        $form = $this->factory->createNamed('name', 'Symfony\Component\Form\Extension\Core\Type\WeekType', '2000-W01', [
+            'input' => 'string',
+            'widget' => 'text',
+        ]);
+
+        $this->assertWidgetMatchesXpath($form->createView(), ['attr' => ['class' => 'my&class']],
+            '/div
+    [@class="my&class"]
+    [
+        ./input
+            [@id="name_year"]
+            [@type="number"]
+            [@value="2000"]
+        /following-sibling::input
+            [@id="name_week"]
+            [@type="number"]
+            [@value="1"]
+    ]
+    [count(./input)=2]'
+        );
+    }
 }
diff --git a/src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/WeekToArrayTransformerTest.php b/src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/WeekToArrayTransformerTest.php
new file mode 100644
index 0000000000000..3f681622a8a1c
--- /dev/null
+++ b/src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/WeekToArrayTransformerTest.php
@@ -0,0 +1,119 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Form\Tests\Extension\Core\DataTransformer;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\Form\Exception\TransformationFailedException;
+use Symfony\Component\Form\Extension\Core\DataTransformer\WeekToArrayTransformer;
+
+class WeekToArrayTransformerTest extends TestCase
+{
+    public function testTransform()
+    {
+        $transformer = new WeekToArrayTransformer();
+
+        $this->assertSame(['year' => 2019, 'week' => 1], $transformer->transform('2019-W01'));
+    }
+
+    public function testTransformEmpty()
+    {
+        $transformer = new WeekToArrayTransformer();
+
+        $this->assertSame(['year' => null, 'week' => null], $transformer->transform(null));
+    }
+
+    /**
+     * @dataProvider transformationFailuresProvider
+     */
+    public function testTransformationFailures($input, string $message)
+    {
+        $this->expectException(TransformationFailedException::class);
+        $this->expectExceptionMessage($message);
+
+        $transformer = new WeekToArrayTransformer();
+        $transformer->transform($input);
+    }
+
+    public function transformationFailuresProvider(): array
+    {
+        return [
+            'malformed string' => ['lorem', 'Given data does not follow the date format "Y-\WW".'],
+            'non-string' => [[], 'Value is expected to be a string but was "array".'],
+        ];
+    }
+
+    public function testReverseTransform()
+    {
+        $transformer = new WeekToArrayTransformer();
+
+        $input = [
+            'year' => 2019,
+            'week' => 1,
+        ];
+
+        $this->assertEquals('2019-W01', $transformer->reverseTransform($input));
+    }
+
+    public function testReverseTransformCompletelyEmpty()
+    {
+        $transformer = new WeekToArrayTransformer();
+
+        $input = [
+            'year' => null,
+            'week' => null,
+        ];
+
+        $this->assertNull($transformer->reverseTransform($input));
+    }
+
+    public function testReverseTransformNull()
+    {
+        $transformer = new WeekToArrayTransformer();
+
+        $this->assertNull($transformer->reverseTransform(null));
+    }
+
+    public function testReverseTransformEmpty()
+    {
+        $transformer = new WeekToArrayTransformer();
+
+        $this->assertNull($transformer->reverseTransform([]));
+    }
+
+    /**
+     * @dataProvider reverseTransformationFailuresProvider
+     */
+    public function testReverseTransformFailures($input, string $message)
+    {
+        $this->expectException(TransformationFailedException::class);
+        $this->expectExceptionMessage($message);
+
+        $transformer = new WeekToArrayTransformer();
+        $transformer->reverseTransform($input);
+    }
+
+    public function reverseTransformationFailuresProvider(): array
+    {
+        return [
+            'missing year' => [['week' => 1], 'Key "year" is missing.'],
+            'missing week' => [['year' => 2019], 'Key "week" is missing.'],
+            'integer instead of array' => [0, 'Value is expected to be an array, but was "integer"'],
+            'string instead of array' => ['12345', 'Value is expected to be an array, but was "string"'],
+            'week invalid' => [['year' => 2019, 'week' => 66], 'Week "66" does not exist for year "2019".'],
+            'year null' => [['year' => null, 'week' => 1], 'Year is expected to be an integer, but was "NULL".'],
+            'week null' => [['year' => 2019, 'week' => null], 'Week is expected to be an integer, but was "NULL".'],
+            'year non-integer' => [['year' => '2019', 'week' => 1], 'Year is expected to be an integer, but was "string".'],
+            'week non-integer' => [['year' => 2019, 'week' => '1'], 'Week is expected to be an integer, but was "string".'],
+            'unexpected key' => [['year' => 2019, 'bar' => 'baz', 'week' => 1, 'foo' => 'foobar'], 'Expected only keys "year" and "week" to be present, but also got ["bar", "foo"].'],
+        ];
+    }
+}
diff --git a/src/Symfony/Component/Form/Tests/Extension/Core/Type/WeekTypeTest.php b/src/Symfony/Component/Form/Tests/Extension/Core/Type/WeekTypeTest.php
new file mode 100644
index 0000000000000..aea4c064b33c9
--- /dev/null
+++ b/src/Symfony/Component/Form/Tests/Extension/Core/Type/WeekTypeTest.php
@@ -0,0 +1,323 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Form\Tests\Extension\Core\Type;
+
+use Symfony\Component\Form\FormError;
+
+class WeekTypeTest extends BaseTypeTest
+{
+    const TESTED_TYPE = 'Symfony\Component\Form\Extension\Core\Type\WeekType';
+
+    public function testSubmitArray()
+    {
+        $form = $this->factory->create(static::TESTED_TYPE, null, [
+            'widget' => 'choice',
+            'input' => 'array',
+        ]);
+
+        $form->submit([
+            'year' => '2019',
+            'week' => '1',
+        ]);
+
+        $this->assertSame(['year' => 2019, 'week' => 1], $form->getData());
+    }
+
+    public function testSubmitString()
+    {
+        $form = $this->factory->create(static::TESTED_TYPE, null, [
+            'years' => [2019],
+            'input' => 'string',
+            'widget' => 'choice',
+        ]);
+
+        $form->submit([
+            'year' => '2019',
+            'week' => '1',
+        ]);
+
+        $this->assertEquals('2019-W01', $form->getData());
+    }
+
+    public function testSubmitStringSingleText()
+    {
+        $form = $this->factory->create(static::TESTED_TYPE, null, [
+            'years' => [2019],
+            'input' => 'string',
+            'widget' => 'single_text',
+        ]);
+
+        $form->submit('2019-W01');
+
+        $this->assertEquals('2019-W01', $form->getData());
+    }
+
+    public function testPassDefaultPlaceholderToViewIfNotRequired()
+    {
+        $view = $this->factory->create(static::TESTED_TYPE, null, [
+            'required' => false,
+            'widget' => 'choice',
+        ])
+            ->createView();
+
+        $this->assertSame('', $view['year']->vars['placeholder']);
+        $this->assertSame('', $view['week']->vars['placeholder']);
+    }
+
+    public function testPassNoPlaceholderToViewIfRequired()
+    {
+        $view = $this->factory->create(static::TESTED_TYPE, null, [
+            'required' => true,
+            'widget' => 'choice',
+        ])
+            ->createView();
+
+        $this->assertNull($view['year']->vars['placeholder']);
+        $this->assertNull($view['week']->vars['placeholder']);
+    }
+
+    public function testPassPlaceholderAsString()
+    {
+        $view = $this->factory->create(static::TESTED_TYPE, null, [
+            'placeholder' => 'Empty',
+            'widget' => 'choice',
+        ])
+            ->createView();
+
+        $this->assertSame('Empty', $view['year']->vars['placeholder']);
+        $this->assertSame('Empty', $view['week']->vars['placeholder']);
+    }
+
+    public function testPassPlaceholderAsArray()
+    {
+        $view = $this->factory->create(static::TESTED_TYPE, null, [
+            'placeholder' => [
+                'year' => 'Empty year',
+                'week' => 'Empty week',
+            ],
+            'widget' => 'choice',
+        ])
+            ->createView();
+
+        $this->assertSame('Empty year', $view['year']->vars['placeholder']);
+        $this->assertSame('Empty week', $view['week']->vars['placeholder']);
+    }
+
+    public function testPassPlaceholderAsPartialArrayAddEmptyIfNotRequired()
+    {
+        $view = $this->factory->create(static::TESTED_TYPE, null, [
+            'required' => false,
+            'placeholder' => [
+                'year' => 'Empty year',
+            ],
+            'widget' => 'choice',
+        ])
+            ->createView();
+
+        $this->assertSame('Empty year', $view['year']->vars['placeholder']);
+        $this->assertSame('', $view['week']->vars['placeholder']);
+    }
+
+    public function testPassPlaceholderAsPartialArrayAddNullIfRequired()
+    {
+        $view = $this->factory->create(static::TESTED_TYPE, null, [
+            'required' => true,
+            'placeholder' => [
+                'year' => 'Empty year',
+            ],
+            'widget' => 'choice',
+        ])
+            ->createView();
+
+        $this->assertSame('Empty year', $view['year']->vars['placeholder']);
+        $this->assertNull($view['week']->vars['placeholder']);
+    }
+
+    public function testPassHtml5TypeIfSingleTextAndHtml5Format()
+    {
+        $view = $this->factory->create(static::TESTED_TYPE, null, [
+            'widget' => 'single_text',
+        ])
+            ->createView();
+
+        $this->assertSame('week', $view->vars['type']);
+    }
+
+    public function testDontPassHtml5TypeIfHtml5NotAllowed()
+    {
+        $view = $this->factory->create(static::TESTED_TYPE, null, [
+            'widget' => 'single_text',
+            'html5' => false,
+        ])
+            ->createView();
+
+        $this->assertArrayNotHasKey('type', $view->vars);
+    }
+
+    public function testDontPassHtml5TypeIfNotSingleText()
+    {
+        $view = $this->factory->create(static::TESTED_TYPE, null, [
+            'widget' => 'text',
+        ])
+            ->createView();
+
+        $this->assertArrayNotHasKey('type', $view->vars);
+    }
+
+    public function testYearTypeChoiceErrorsBubbleUp()
+    {
+        $error = new FormError('Invalid!');
+        $form = $this->factory->create(static::TESTED_TYPE, null, [
+            'widget' => 'choice',
+        ]);
+
+        $form['year']->addError($error);
+
+        $this->assertSame([], iterator_to_array($form['year']->getErrors()));
+        $this->assertSame([$error], iterator_to_array($form->getErrors()));
+    }
+
+    public function testWeekTypeChoiceErrorsBubbleUp()
+    {
+        $error = new FormError('Invalid!');
+        $form = $this->factory->create(static::TESTED_TYPE, null, [
+            'widget' => 'choice',
+        ]);
+
+        $form['week']->addError($error);
+
+        $this->assertSame([], iterator_to_array($form['week']->getErrors()));
+        $this->assertSame([$error], iterator_to_array($form->getErrors()));
+    }
+
+    public function testPassDefaultChoiceTranslationDomain()
+    {
+        $form = $this->factory->create(static::TESTED_TYPE, null, [
+            'widget' => 'choice',
+        ]);
+
+        $view = $form->createView();
+
+        $this->assertFalse($view['year']->vars['choice_translation_domain']);
+        $this->assertFalse($view['week']->vars['choice_translation_domain']);
+    }
+
+    public function testPassChoiceTranslationDomainAsString()
+    {
+        $form = $this->factory->create(static::TESTED_TYPE, null, [
+            'choice_translation_domain' => 'messages',
+            'widget' => 'choice',
+        ]);
+
+        $view = $form->createView();
+        $this->assertSame('messages', $view['year']->vars['choice_translation_domain']);
+        $this->assertSame('messages', $view['week']->vars['choice_translation_domain']);
+    }
+
+    public function testPassChoiceTranslationDomainAsArray()
+    {
+        $form = $this->factory->create(static::TESTED_TYPE, null, [
+            'choice_translation_domain' => [
+                'year' => 'foo',
+                'week' => 'test',
+            ],
+            'widget' => 'choice',
+        ]);
+
+        $view = $form->createView();
+        $this->assertSame('foo', $view['year']->vars['choice_translation_domain']);
+        $this->assertSame('test', $view['week']->vars['choice_translation_domain']);
+    }
+
+    public function testSubmitNull($expected = null, $norm = null, $view = null)
+    {
+        $form = $this->factory->create($this->getTestedType(), null, [
+            'widget' => 'choice',
+        ]);
+        $form->submit(null);
+
+        $this->assertSame(['year' => null, 'week' => null], $form->getData());
+        $this->assertSame(['year' => null, 'week' => null], $form->getNormData());
+        $this->assertSame(['year' => null, 'week' => null], $form->getViewData());
+    }
+
+    public function testSubmitFromChoiceEmpty()
+    {
+        $form = $this->factory->create(static::TESTED_TYPE, null, [
+            'widget' => 'choice',
+            'required' => false,
+        ]);
+
+        $form->submit([
+            'year' => '',
+            'week' => '',
+        ]);
+
+        $this->assertSame(['year' => null, 'week' => null], $form->getData());
+    }
+
+    public function testSubmitNullWithText()
+    {
+        $form = $this->factory->create(static::TESTED_TYPE, null, [
+            'widget' => 'text',
+        ]);
+        $form->submit(null);
+
+        $this->assertSame(['year' => null, 'week' => null], $form->getViewData());
+    }
+
+    public function testSubmitNullWithSingleText()
+    {
+        $form = $this->factory->create(static::TESTED_TYPE, null, [
+            'widget' => 'single_text',
+            'input' => 'string',
+        ]);
+        $form->submit(null);
+
+        $this->assertNull($form->getData());
+        $this->assertNull($form->getNormData());
+        $this->assertSame('', $form->getViewData());
+    }
+
+    public function testSubmitNullUsesDefaultEmptyData($emptyData = [], $expectedData = null)
+    {
+        $form = $this->factory->create(static::TESTED_TYPE, null, [
+            'empty_data' => $emptyData,
+            'widget' => 'choice',
+        ]);
+        $form->submit(null);
+
+        $this->assertSame(['year' => null, 'week' => null], $form->getData());
+    }
+
+    /**
+     * @dataProvider provideEmptyData
+     */
+    public function testSubmitNullUsesDateEmptyDataString($widget, $emptyData, $expectedData)
+    {
+        $form = $this->factory->create(static::TESTED_TYPE, null, [
+            'widget' => $widget,
+            'empty_data' => $emptyData,
+        ]);
+        $form->submit(null);
+
+        $this->assertSame($expectedData, $form->getData());
+    }
+
+    public function provideEmptyData()
+    {
+        return [
+            'Compound text field' => ['text', ['year' => '2019', 'week' => '1'], ['year' => 2019, 'week' => 1]],
+            'Compound choice field' => ['choice', ['year' => '2019', 'week' => '1'], ['year' => 2019, 'week' => 1]],
+        ];
+    }
+}

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