php - Make DateTime::createFromFormat() return child class instead of parent -

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I'm expanding DateTime to add some useful methods and constants < P> Everything is okay when using the new to create a new object, but when using the static method createFromFormat it always returns the original DateTime object And certainly none of the hair methods are available.

Am I using the following code to solve this problem? Is this the best way? 

  Name space noilibbs \ datetime; Class datetime extension \ datetime {static public function createFromFormat ($ format, $ time) {$ ext_dt = new self (); $ Ext_dt- & gt; Settimestamp (guardian :: createFromFormat ($ format, time) -> getTimestamp ()); Return $ ext_dt; }}    
 
 
 This is a way to go though, because you think what you do Want to provide Extensible DateTime class, I suggest you use  static  instead of  self :  
  Namespace NoiseLabs \ DateTime; Class Datetime extension \ datetime {stable public function createFromFormat ($ format, $ time) is {$ ext_dt = new static (); $ Ext_dt- & gt; Settimestamp (guardian :: createFromFormat ($ format, $ time) -> getTimestamp ()); Return $ ext_dt; }}   
 If you do not plan to expand the class, then it is not necessary, but if anyone does, then it will prevent them from repeating the same action.

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