The engine treats the in-game clock as local sun time, with the sun highest at 12:00. Servers set up to run in real time follow the host's clock:

serverTime="SystemTime";

serverTimeAcceleration=1;

serverNightTimeAcceleration=1;

From March to October that clock is on summer time (e.g. CEST), one hour ahead of sun time. For half the year, sunrise, midday and sunset all happen about an hour earlier than the clock players see.

As a result, it gets dark an hour earlier than in real life from spring to autumn, and in-game clocks never match the real sun.

Steps to reproduce

1. Run a server with the settings above on a host in a DST time zone, during summer time.

2. Compare in-game sunset with the real sunset at the same clock time.

Expected: the sun follows the clock the server shows, as in real life.

Actual: the sun is about one hour early.

Suggestion

Add a serverDZ.cfg option to account for DST, for example a UTC/sun-time offset or a "follow DST" flag, so a real-time server's day/night cycle matches the wall clock all year.

The in-game clock keeps showing the real server time (e.g. CEST), and during summer time the engine positions the sun one hour behind the clock (sun time = clock − 1 h). At 13:00 CEST the sun is at its highest, just like in real life, and sunrise and sunset match the real times