variables;
short oldtime,newtime,daycount,hour;

...

beginstate START_SCEN_STATE;
// Initialize time counter
set_flag(0,2,1);
set_flag(0,4,1);

...

// This state is called every tick wherever the party is in the scenario.
// I use it to track time. Avernum appears to have a 20 hour day that
// starts at 5 and nightfalls around 20.
//
// Requires flag 0,0 (time), 0,1 (oldtime msb) and 0,2 (oldtime lsb)
// 0,3 (daycount msb), 0,4 (daycount lsb)
beginstate START_STATE;
oldtime = ( get_flag(0,1) * 250 ) + get_flag(0,2);
daycount = ( get_flag(0,3) * 250 ) + get_flag(0,4);
newtime = get_current_tick();
daycount = daycount + tick_difference(oldtime,newtime);
set_flag(0,1,( newtime / 250 ) );
set_flag(0,2,( newtime % 250 ) );

if ( daycount >= 5000) {
daycount = daycount - 5000;
}

hour = ( daycount / 250 ) + 5;

if ( hour > 20 ) {
hour = hour - 20;
}

set_flag(0,0,hour);
set_flag(0,3,( daycount / 250 ) );
set_flag(0,4,( daycount % 250 ) );

print_big_str("Current time: ",hour,".");
break;