Timeline or time function in PostgreSQL

In MySQL I can use this select which show timeline view on data in my table/tables.

SELECT COUNT(atribute), connection_timestamp 
FROM db 
GROUP BY DAYOFYEAR(connection_timestamp) 
ORDER BY connection_timestamp ASC;

But I need the same timeline view in PostreSQL database too. Can you help me please how I can obtain the same effect? Function DAYOFYER does not exist in PostgreSQL. Thank you for help.

Format would look like:

15.10.2014  0
16.10.2014  0
17.10.2014  4
18.10.2014  4
19.10.2014  2
20.10.2014  1
21.10.2014  5
22.10.2014  7

After this select:

SELECT 
  TO_CHAR(connection_timestamp, 'DD.MM.YYYY'),
  COUNT(atribute)
FROM dionaea.connections 
GROUP BY TO_CHAR(connection_timestamp, 'DD.MM.YYYY') 
ORDER BY 1;

output is messy:

  to_char   | count
------------+--------
 01.01.2015 |   5225
 01.08.2014 |   4326
 01.09.2014 |  14509
 01.10.2014 |   2022
 02.01.2015 |   2992
 02.08.2014 |   6064
 02.09.2014 |   9948
 03.01.2015 |   2847