Yii behavior that auto detects timestamps and applies custom conversion on their values.

YiiAutoTimestampBehavior.php

<?php

class MyBehavior extends CActiveRecordBehavior
{
	public to='yyyy-MM-dd';
	public $from='Y-m-d';

	public function beforeSave($event)
	{
		foreach ($this->owner->tableSchema->columns as $attribute => $column)
		{
			if (strpos($column->dbType, 'timestamp') === 0)
			{
				if ($this->owner->$attribute)
					$this->owner->$attribute = date($this->from, CDateTimeParser::parse($this->owner->$attribute, $this->to));
			}
		}
	}
	 
	public function beforeSave($event)
	{
		foreach ($this->owner->tableSchema->columns as $attribute => $column)
		{
			if (strpos($column->dbType, 'timestamp') === 0)
			{
				if ($this->owner->$attribute)
					$this->owner->$attribute = Yii::app()->dateFormatter->format($this->to, $this->owner->$attribute);
			}
		}
	}
}