Issue #2260241 by ultimike, benjy, er.pushpinderrana: Fixed D6->D8 Profile field (date).

core/modules/migrate_drupal/config/install/migrate.migration.d6_user_profile_field.yml

@@ -18,6 +18,9 @@ process:
       textfield: text
       textarea: text_long
       url: link
+  settings:
+    plugin: d6_profile_field_settings
+    source: type
   settings.allowed_values: options
   cardinality:
     plugin: static_map

core/modules/migrate_drupal/src/Plugin/migrate/process/d6/ProfileFieldSettings.php

+<?php
+
+/**
+ * @file
+ * Contains \Drupal\migrate_drupal\Plugin\migrate\Process\d6\ProfileFieldSettings.
+ */
+
+namespace Drupal\migrate_drupal\Plugin\migrate\Process\d6;
+
+use Drupal\migrate\MigrateExecutable;
+use Drupal\migrate\ProcessPluginBase;
+use Drupal\migrate\Row;
+
+/**
+ * @MigrateProcessPlugin(
+ *   id = "d6_profile_field_settings"
+ * )
+ */
+class ProfileFieldSettings extends ProcessPluginBase {
+
+  /**
+   * {@inheritdoc}
+   *
+   * Set the profile field settings configuration.
+   */
+  public function transform($type, MigrateExecutable $migrate_executable, Row $row, $destination_property) {
+    $settings = array();
+    switch ($type) {
+      case 'date':
+        $settings['datetime_type'] = 'date';
+        break;
+    }
+    return $settings;
+  }
+
+}

core/modules/migrate_drupal/src/Tests/d6/MigrateUserProfileFieldTest.php

@@ -86,6 +86,7 @@ public function testUserProfileFields() {
     // Migrated date field.
     $field = entity_load('field_config', 'user.profile_birthdate');
     $this->assertEqual($field->type, 'datetime', 'Field type is datetime.');
+    $this->assertEqual($field->settings['datetime_type'], 'date');
   }
 
 }