Int to date

Hi Does anyone know how to convert an integer (currently in an sqlite DB) into a meaningful date using PHP. An example of the date is '2455217' or '2455231', I have spent three days tring to find a solution but just cannot figure it out and nothing in the forums. Any help would be appreciated. Thanks in advance.

 

echo date('Y-m-d',2455217)."\n";

PHP:

 

Trouble is the dates dont come out right, they all come out as 29-01-1970 when I know that 2455217=20 Jan 2010 and 2455241=13 Feb 2010. Is there some special formula you are meant to use.

 

This will give you an idea to solve your problem
http://old.nabble.com/datetime-as-integer-td22490623.html