Q:

PHP DateTime __construct() Failed to parse time string (xxxxxxxx) at position x

I had this construction error when trying to creating a new DateTime object using a timestamp:

Exception: DateTime::_construct(): Failed to parse time string (1372622987) at position 8 (8): Unexpected character in DateTime->_construct()

The object creation code is:
$start_date = new DateTime( "@{$dbResult->db_timestamp}" );

Where $dbResult->db_timestamp is a valid unix timestamp taken from a database.  The timestamp in question was:

1372622987

I would understand this error for invalid formats being passed, but this is a genuine timestamp. 
The reason this is very strange: I since ran a script to create a new DateTime object with the timestamp passed in as a hard coded value, and it reported no errors. 
This seems to have been a one off, but I need an explanation if there is one, as I can't afford for this to happen again. 

A:

You should use setTimestamp instead, if you hardcode it:
$start_date = new DateTime();
$start_date->setTimestamp(1372622987);

in your case
$start_date = new DateTime();
$start_date->setTimestamp($dbResult->db_timestamp);

A:

Use the createFromFormat method:
$start_date = DateTime::createFromFormat("U", $dbResult->db_timestamp);
UPDATE
I now recommend the use of Carbon

A:

change your code to this
$start_date = new DateTime( "@" .  $dbResult->db_timestamp );

and it will work fine

