code for built in datetime class

this example extends the built in datetime class code

http://www.experts-exchange.com/Web_Development/Web_Languages-Standards/PHP/Q_28236754.html#a39484253

what is the built in datetime class code

I can not find the code on php.net
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rgb192Asked:
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Ray PaseurCommented:
Since it is a built-in class, PHP does not provide the code.  It's just "built in."  The man pages describe the methods and show how to use them.
http://php.net/manual/en/class.datetime.php

Conceptually this is the same as trying to find the code for strtotime().  It's not shown on the PHP site, but there is a good description and examples, with user-contributed notes.
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rgb192Author Commented:
ok, the code is not there

thanks
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