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:

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