Real-Time events with Renpy

[Gushi]

So I was wondering if there is any way to implement a feature where the game tracks the computers time in real life and a certain event will happen in game during a certain amount of time, I'm not sure how I could describe it other than:

After 30 minutes pass something will happen, this event lasts for 15 minutes, after this timeframe this event will end, and it repeats like this until the person quits the game.

I was thinking about using this for an extra, secret route or something but for now I'm just kind of experimenting with Renpy and just want to know how to do cool things like this.

[Imperf3kt]

Certainly possible by using python datetime.

Look herefor example usage.
viewtopic.php?f=8&t=51735&p=495270#p495270

[Gushi]

I already know how to do that, what I'm asking is how would I be able to make something available during a certain time and end after a certain amount of time.

[Imperf3kt]

That module returns the time as a variable, so just treat it as such
Make a screen, slap in an 'if time is this, do this' and show the screen

I'd like to link you a better example, but cannot find it through both the search function, and google.