fixed issue #5

src/Fields/Date.php

@@ -18,11 +18,17 @@ class Date extends Field
 
     public function formViewValue(Model $item): string
     {
+        if(!$this->getDefault() && $this->isNullable()) {
+            return '';
+        }
+
         return date('Y-m-d', strtotime($item->{$this->name()} ?? $this->getDefault()));
     }
 
     public function indexViewValue(Model $item, bool $container = false): string
     {
-        return date($this->format, strtotime($item->{$this->name()}));
+        return $item->{$this->name()}
+            ? date($this->format, strtotime($item->{$this->name()}))
+            : '';
     }
 }

src/Fields/Field.php

@@ -185,7 +185,7 @@ public function save(Model $item): Model
     {
         $item->{$this->field()} = $this->requestValue() !== false
             ? $this->requestValue()
-            : '';
+            : ($this->isNullable() ? null : '');
 
         return $item;
     }

tests/Fields/DateTest.php

@@ -0,0 +1,74 @@
+<?php
+
+namespace Leeto\MoonShine\Tests\Fields;
+
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Leeto\MoonShine\Fields\Date;
+use Leeto\MoonShine\Models\MoonshineUser;
+use Leeto\MoonShine\Resources\MoonShineUserResource;
+use Leeto\MoonShine\Tests\TestCase;
+
+class DateTest extends TestCase
+{
+    use RefreshDatabase;
+
+    public function test_values()
+    {
+        $user = MoonshineUser::factory()->make([
+            'created_at' => '2022-01-01 00:00:00'
+        ]);
+
+        $field = Date::make('Created at')
+            ->format('d.m.Y');
+
+        $this->assertEquals('2022-01-01', $field->formViewValue($user));
+        $this->assertEquals('01.01.2022', $field->indexViewValue($user));
+    }
+
+    public function test_nullable()
+    {
+        $user = new MoonshineUser();
+
+        $field = Date::make('Created at')
+            ->nullable();
+
+        $this->assertEquals('', $field->formViewValue($user));
+        $this->assertEquals('', $field->indexViewValue($user));
+    }
+
+    public function test_default()
+    {
+        $user = new MoonshineUser();
+
+        $field = Date::make('Created at')
+            ->default('2022-01-02');
+
+        $this->assertEquals('2022-01-02', $field->formViewValue($user));
+
+        $field = Date::make('Created at')
+            ->nullable()
+            ->default('2022-01-02');
+
+        $this->assertEquals('2022-01-02', $field->formViewValue($user));
+    }
+
+    public function test_save()
+    {
+        $user = new MoonshineUser();
+
+        $field = Date::make('Created at')
+            ->default('2022-01-02');
+
+        $item = $field->save($user);
+
+        $this->assertEquals('2022-01-02', $item->created_at->format('Y-m-d'));
+
+        $field = Date::make('Created at')
+            ->nullable();
+
+        $item = $field->save($user);
+
+        $this->assertNull($item->created_at);
+
+    }
+}