How can I theme the output of Privatemsg? I took look at http://api.worldempire.ch/api/privatemsg/privatemsg.theme.inc/group/theming/1, but I didn't understood how to use that. I want to totally change the HTML output for the message list.
How do I use my custom date format in the messages? I guess the
format_date() function would help me, but how do I use it correctly?
print format_date($messages_timestamp, 'custom', 'd=m=Y') returns "01.01.1970." What is that?