Fetching Double Value from SQLite in iOS

Though it may seems very simple, I am trying hours on this.

Hello, everyone, I am storing double value in a SQLite Database in iPad application.

I am fetching all the records using simple "Select * from tableName" query.

then I am converting this patient_dos value to double.

But this is what it prints when I display content of the first patient dictionary.

"patient_dos" = "1461561219160.408936";

and this below is the value I get after converting this value in to double variable.

Printing description of patient->_dos:
(double) _dos = 1461561767624.27

My main concern is to match this double, It is actually a Timestamp, of the Day when patient admitted without HH:MM:SS information.