Bukkit

Time will loop as in real time.

Sunrise and sunset are respectively turned into the game-time.
The duration of a day can be changed.

Lunar-Phases aren't respected yet!

Warning:
This plugin restricts the ability to manipulate time in any way.
You may not be able to use '/time set n" or skip the night by going to sleep!

Going to sleep will still work, but has no effect on the time what so ever.
Still remains for roll-playing though.

no errors are known.

if the settings aren't set well, the console will return warnings, that are generated by the plugin itself.