Ever since I started playing The Sims 3 in 2009 I thought sunrise and sunset times in the game were not very realistic. This lead me to create the Longer Days Mod three years ago (hosted here at MTS: http://modthesims.info/download.php?t=421863) but when the Seasons EP released I felt there was more to be done. EA had coded a sunset/sunrise offset that changed the sun times over the seasons but it just wasn't right. The default was still daytime between 6 and 18 in summer and then shorter days all the other reasons, which made no sense to me. So here's a mod changing the offsets, without changing the INI files.
There are two versions of the mod, and you should only use ONE at a time:
Stockholm
This version changes the sunrise/sunset times to a more realistic one, matching the ones in Stockholm, Sweden - which happens to be my hometown. I used the Stockholm sunrise/sunset data from 2013 for spring equinox, summer solstice, autumn equinox and winter solstice and applied these to the four seasons. This makes for these sunrise/sunset times*: