editing external.php

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I have an RSS feed running and the output is showing the thread title and thread poster. I am wanting it to also show the date and time of the thread. What variable would I use? This is what I am using so far (datefield isnt working):

echo 'thread: '.$threads[$i]['title'].' -- '.$threads[$i]['postusername'].' ( '.$threads[$i]['datefield'].' )<br />';

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