The change of night and day

Greetings.
I want to implement a plugin for the Rast server.

The plugin will control the change of day and night of the real time zone of Moscow time. For example, if it is 19:00 in Moscow, then the server will have the same time.
For work, I can not find a variable that contains the time of day of Rust, then it needs to be equated to Moscow time. This is real?

Thanks!