[tyldum]

Polar area here. So, in the transition from summer to winter the day is shortened about 15-20 minutes each day. And vice versa from winter to summer.

And at some point in the summer, the sun never sets. During winter it never rises...

Time isn't easy on a global scale.

[moltke]

Right, I think local rules make way more sense than DST for situations like that just like they make more sense for places close to the equator.