[tzs]

It's really a simple question. How should you approximate this curve?

   ....................*****.....
   .................***.....**...
   ................*..........**.
   *.............**.............*
   .**..........*................
   ...**.....***.................
   .....*****....................

If you think it should be this, you want permanent standard time:

   ..............................
   ..............................
   ..............................
   ******************************
   ..............................
   ..............................
   ..............................

If you think it should be this, you want permanent summer time:

   ..............................
   ..............................
   ******************************
   ..............................
   ..............................
   ..............................
   ..............................

If you think it should be something like this, you want some kind of DST system:

   ..............................
   ..............................
   ****..........****************
   ..............................
   ....*********.................
   ..............................
   ..............................

[sixothree]

There are two curves to account - sunrise and sunset. Daylight savings attempts to flatten one of those and not the other!

[dezzeus]

Yes, because DST correctly attempt to adjusts Sunrise towards our usual wake-up time (obviously it can't do miracles).