可捕获的致命错误:DateTime类的对象无法转换为字符串 - Catchable fatal error: Object of class DateTime could not be converted to string

Catchable fatal error: Object of class DateTime could not be converted to string

这是我得到的数组

 Array
(
[0] => BugHerd_Project Object
(
    [id:BugHerd_Project:private] => 24323
    [name:BugHerd_Project:private] => bugherd a
    [devurl:BugHerd_Project:private] => http://st.com/a/
    [active:BugHerd_Project:private] => 1
    [created:BugHerd_Project:private] => DateTime Object
        (
            [date] => 2014-05-03 11:15:22
            [timezone_type] => 2
            [timezone] => Z
        )
    [updated:BugHerd_Project:private] => DateTime Object
        (
            [date] => 2014-05-05 06:55:52
            [timezone_type] => 2
            [timezone] => Z
        )
)

)

/* *获取项目最后创建的日期* @return DateTime项目创建日期*/

public function getCreated() {
return $this->created;
 }

我已经写了下面的代码从数组
访问日期
on do print_r($projects_particular->getCreated());
数组的输出在这里:
```
  DateTime Object
 (
 [date] => 2014-05-05 10:04:30
[timezone_type] => 2
[timezone] => Z
  )
```
i received error:Catchable fatal error: Object of class DateTime无法转换为string
- 我只是想访问日期。

public function getCreated() {
return $yourarray->created->date;
 }
public function getid(){
   return $yourarray->id
}