TimestampBehavior is not working in Yii2 - yii2

Question

public function behaviors()
{
return [
'verbs' => [
'class' => VerbFilter::className(),
'actions' => [
'delete' => ['post'],
],
],
'access' => [
'class' => AccessControl::className(),
'only' => ['create', 'update', 'delete', 'view', 'index'],
'rules' => [
// allow authenticated users
[
'allow' => true,
'roles' => ['#'],
],
// everything else is denied by default
],
],
[
'class' => TimestampBehavior::className(),
'attributes' => [
ActiveRecord::EVENT_BEFORE_INSERT => ['create_time', 'update_time'],
ActiveRecord::EVENT_BEFORE_UPDATE => ['update_time'],
],
],
];
}
Above code is for my controller behavior function. While creating or updating, 'create_time' and 'update_time' fields are not getting updated by current time. Type of those fields are set to datetime. Please need your help.

Answer 1

You have to declare it in the behaviors method of your model.
To use TimestampBehavior, insert the following code to your ActiveRecord class
public function behaviors()
{
return [
'class' => TimestampBehavior::className(),
'attributes' => [
ActiveRecord::EVENT_BEFORE_INSERT => ['create_time', 'update_time'],
ActiveRecord::EVENT_BEFORE_UPDATE => ['update_time'],
],
];
}

Answer 2

Try this, it works for me:
use yii\db\Expression;
...
[
'class' => TimestampBehavior::className(),
'updatedAtAttribute' => 'update_time',
'value' => new Expression('NOW()'),
],

Answer 3

You can also use
'value' => date('Y-m-d H:i:s')
if you would like to use the PHP datetime.

Answer 4

I used new Expression('NOW()') to store current timestamp. But It does't store the date based on current timezone. Instead it stores based on server time.
I just used normal php date function to solve this.
eg :
use yii\behaviors\TimestampBehavior;
use yii\db\Expression;
public function behaviors()
{
return [
'timestamp' => [
'class' => 'yii\behaviors\TimestampBehavior',
'attributes' => [
ActiveRecord::EVENT_BEFORE_INSERT => ['created_at', 'updated_at'],
ActiveRecord::EVENT_BEFORE_UPDATE => ['updated_at'],
],
'value' => date('Y-m-d H:i:s'),
],
];
}

Answer 5

You must also add the value and use the class Expression
use yii\behaviors\TimestampBehavior;
use yii\db\Expression;
public function behaviors()
{
return [
'timestamp' => [
'class' => 'yii\behaviors\TimestampBehavior',
'attributes' => [
ActiveRecord::EVENT_BEFORE_INSERT => ['created_at', 'updated_at'],
ActiveRecord::EVENT_BEFORE_UPDATE => ['updated_at'],
],
'value' => new Expression('NOW()'),
],
];
}