This plugin will check the time it is on the server every 60 seconds, and every time the hour ticks down it will change the amount of daylight (lighting) the map gets.
In plain terms, the closer it is to the night the darker the server will get, the closer it is to the afternoon/dawn the lighter the server will get.
Note: You will need Engine Module.
Changelog:
v1.0 - Initial Release
v1.1 - Ported to AMXx
v1.2 - Made midnight work, servers wouldd not read 24th hour.