MC×RealisticDaytime

MC×RealisticDaytime lets you pick an UTC timezone offset in the config, and just like that, your server’s day-night cycle matches real-world time in a smooth 24-hour rotation.
To also get accurate sunrise/sunset/etc... times, download the premium version (WIP)

It also disables the normal daylight cycle so it won’t mess with the timing, and keeps an eye on it — it will automatically disable it