First in the file templatesja_teline_ivblockstopbar.php change the lines
<p class=”ja-day clearfix”>
<?php
echo “<span class=”day”>”.date (‘D’).”</span>”;
echo “<span class=”month”>”.date (‘m’).”</span>”;
echo “<span class=”date”>”.date (‘d’).”</span>”;
echo “<span class=”year”>”.date (‘Y’).”</span>”;
?>
</p>
To :
<p class=”ja-day clearfix”>
<?php
echo “<span class=”day”>”.date (‘D’).”</span>”;
echo “<span class=”month”>”.date (‘d’).”</span>”;
echo “<span class=”date”>”.date (‘m’).”</span>”;
echo “<span class=”year”>”.date (‘Y’).”</span>”;
?>
</p>
and then, if you still have the short day in GB language (on year mouseover), so go to the code :
echo “<span class=”day”>”.date (‘D’).”</span>”;
and change it to :
echo “<span class=”day”>”.JText::_(date (‘D’)).”</span>”;
(That’s the problem I had and solved with this forum help (thanks to dathq))
http://www.joomlart.com/forums/topic/mon-instead-of-lun-in-date/