@Loopix: Something like this should do it
Code:

---

define hours_a_day, 24;
define days_a_month, 30;
define months_a_year, 12;

define time_offset, 6;

var time_hour;
var time_day;
var time_month;
var time_year;

function TimeCounter()
{
	var check;
	
	while(1)
	{
		while(1)
		{
			time_hour = sun_angle.pan/(360/hours_a_day);
			time_hour += time_offset;
			time_hour %= hours_a_day;
			
			if(time_hour > 0.9){check = 1;}
			if(time_hour < 0.5 && check){check = 0; break;}
			
			wait(1);
		}
		
		time_day += 1;
		
		if(time_day == days_a_month)
		{
			time_day = 0;
			time_month += 1;
			
			if(time_month == months_a_year)
			{
				time_year += 1;
				time_month = 0;
			}
		}
		
		wait(1);
	}
}

---

@Manslayer101: I don´t know either what you mean with quake3 style...