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Where can I find an international format for the date?

In Calander's settings you will find use international format.

I would like to add the calender in my sidebar in an different style than on my pages. How can i do it?

print the follwing function in your php code:

echoLarsensCalender( $day, $month, $year, $time, $howmany, $order, $international);

 $day     0     do not display day
          1     display day
 &month   -1    do not display month
          1     month as integer
          2     display name of month
          3     display shorted name of month
$year     0     do not display year
          1     display year
$time     0     do not display time
          1     only display hours 
          2     display hours and minutes
$howmany        maximum number of events that shall be displayed
$order    1     oldest top, newest bottom
          2     oldest bottom, newest top
$international
         -1     display date as you set the options above
         1      October 5th, 2008 9.00 am
         2      5th October 2008 9.00 am
         3      5 Oct 2008 9.00 am

e.g.: <?php print echoLarsensCalender ( 1, 1, 1, 2, 10, 2, -1); ?> causes 26.10.2008 14:00 Uhr

Can I change the design of the calender?

yeah, cou can. you're welcome to change larsenscalender.css that you find in the plugin directory.