This code implement happy hour functionality.
Administrator Menu > Maintenance > Resources
Add the below lines of code in event.addline resource.
import java.util.Calendar;
Calendar cal = Calendar.getInstance();
int hour = cal.get(Calendar.HOUR_OF_DAY);
//Discount
discountrate = 0.2;
//Happy hour range
start = 12;
end = 16;
if (hour>=start && hour<end) {
p = line.getPrice();
line.setSalePrice(p - (p*discountrate));
}
Save & restart