Yii2 View DateTime Format (d-m-Y H:i:s) But When Save/update in DB Change format to Y-m-d H:i:s

Need to just add this code before save/update model in controller.

like,

// ICU format
$model->Created = Yii::$app->formatter->asDate($_POST['modelName']['Created'], 'yyyy-MM-dd HH:mm:ss'); // 2014-10-06 15:22:34

OR

// PHP date()-format
$model->Created = Yii::$app->formatter->asDate($_POST['modelName']['Created'], 'php:Y-m-d H:i:s'); // 2014-10-06 15:22:34

For more information refer this link

Finally I found the answer using AttributeBehavior.

In my model class I've write the behaviors code:

public function behaviors()
{
    return [
        [
            'class' => AttributeBehavior::className(),
            'attributes' => [
                // update 1 attribute 'created' OR multiple attribute ['created','updated']
                ActiveRecord::EVENT_BEFORE_INSERT => ['created','updated'],
                ActiveRecord::EVENT_BEFORE_UPDATE => 'updated',
            ],
            'value' => function ($event) {
                return date('Y-m-d H:i:s', strtotime($this->Created));
            },
        ],
    ];
}

My Model Class

    namespace frontend\models;

use Yii;
use yii\db\ActiveRecord;
use yii\behaviors\AttributeBehavior;
/**
 * This is the model class for table "product".
 *
 * @property integer $id
 * @property integer $product_id
 * @property string $product_name
 * @property string $created
 * @property string $updated
 */
class Product extends ActiveRecord
{
    public $csv_file;

    /**
     * @inheritdoc
     */
    public static function tableName()
    {
        return 'product';
    }

    public function behaviors()
    {
        return [
            [
                'class' => AttributeBehavior::className(),
                'attributes' => [
                    ActiveRecord::EVENT_BEFORE_INSERT => ['created','updated'], // update 1 attribute 'created' OR multiple attribute ['created','updated']
                    ActiveRecord::EVENT_BEFORE_UPDATE => 'updated', // update 1 attribute 'created' OR multiple attribute ['created','updated']
                ],
                'value' => function ($event) {
                    return date('Y-m-d H:i:s', strtotime($this->LastUpdated));
                },
            ],
        ];
    }

    /**
     * @inheritdoc
     */
    public function rules()
    {
        return [
            [['id', 'product_id', 'product_name', created, updated], 'required'],

        ];
    }

    /**
     * @inheritdoc
     */
    public function attributeLabels()
    {
        return [
            'id' => 'ID',
            'product_id' => 'Product ID',
            'product_name' => 'Product Name',
            'created' => 'Created',
            'updated' => 'Updated',
        ];
    }
}

If input format is d/m/Y then you need to replace the "/" by "-"

like: input date(created): 10/09/2015

date('Y-m-d H:i:s', strtotime(str_replace("/","-",$this->created)));