Getting norwegian day of week in norwegian

[bengt]

How can i get weekdays in norwegian?
I get day of week from the datetime field in a table.
This produces mon, tue, wed, etc. How can I easily get this to be, mandag, tirsdag, onsdag, etc?

[Shrike]

$translate_days = array("mon" => "mandag", etc. );
$day = "mon";
echo $translate_days[$day]; // mandag