How to convert 2001 based timestamp to datetime in SQLite?

ZPUBLICATIONDATETIME is of type TIMESTAMP.

So when I do this:

SELECT strftime('%d - %m  - %Y ', datetime(ZPUBLICATIONDATETIME, 'unixepoch')) FROM ZTNNEWS;

I get 26 - 05 - 1984 instead of 2015. iOS (Core Data) writes datetime on 1 Jan 2001 based. What is the best approach to get the right date conversion?

Shall I just add 31 years to it or is there an alternative to unixepoch to put in there?

Essentially what I am trying to do is to get the records from past two days:

select * 
from ZTNNEWS
where DATETIME(ZPUBLICATIONDATETIME) >  DATETIME('now', '-2 day')

But because ZPUBLICATIONDATETIME is of type TIMESTAMP rather than Datetime, it doesn't output anything.

Any advice please?