[Abagail]

You'd need to script it into your game-mode. For instance, you can call a timer to change it every 10 minutes based on the server's time. For more information,
https://sampwiki.blast.hk/wiki/SetPlayerTime
https://sampwiki.blast.hk/wiki/SetWorldTime,
https://sampwiki.blast.hk/wiki/SetPlayerWeather,
https://sampwiki.blast.hk/wiki/SetWeather
https://sampwiki.blast.hk/wiki/GetPlayerTime


The SA-MP wiki is your friend... Good luck.