Description:
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Creating a new DateTime object with a unix timestamp failed with error  
Uncaught exception 'Exception' with message 'DateTime::__construct(): Failed to parse time string (1279547855) at position 8 (5): Unexpected character'


If this is expected behaviour, this should be written in documentation and DateTime::setTimestamp() should be fixed:
http://www.php.net/manual/en/datetime.settimestamp.php#Notes
"Passing a Unix timestamp to DateTime::__construct()  is an alternative when using PHP 5.2."



Test script:
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<?php
var_dump(new DateTime(time()));

Expected result:
----------------
no fatal error :)

Actual result:
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Fatal error:  Uncaught exception 'Exception' with message 'DateTime::__construct(): Failed to parse time string (1279547855) at position 8 (5): Unexpected character'