Nikon D80 Lens 1:1.8D settings for day and night exposure?

Nikon D80 Lens 1:1.8D settings for day and night exposure?

Day: Auto mode, Auto ISO, Auto white balance, EV 0, AF on.
Night: Auto mode, ISO 400, Auto white balance, EV 0, flash on, focus manual if auto does not work.

There's no predetermined settings for anything, anywhere, anytime. You have to learn photography to know what to do. If you don't now what you're doing, hopefully, the camera will get it right.

Just use the light meter in your camera.

All you have to do is assure that the shutter speed is faster than 1/250th second to prevent blur caused by camera movement during exposures

This means that when shooting in low light, you will have to increase the ISO of the camera

Night exposures may take some trial and error in manual mode. In theory this lens should be easy to dial to infinity in low light. However, not all samples have the distance scale properly aligned. Do some daytime experiments to discover where real infinity is on the scale.

First, learning about the Exposure Triangle will help you:
http://digital-photography-school.com/learning-exposure-in-digital-photography

Second, learning to use your camera's light meter is mandatory if you are shooting in Manual Mode.
If you've misplaced the Owner's Manual then this site should explain it:
http://www.nikondigitutor.com/eng/d80/index.shtml

My personal preference when shooting during the day is to use ISO 100 and have my camera in Aperture Priority.

For low-light exposures I use and recommend this site:
http://www.calculator.org/...osure.aspx

For these I used the Scene 'Distant view of city skyline or floodlit buildings' and ISO 200 with my camera in Manual and mounted on my tripod:

100mm @ f11, exposure for 30 seconds.

200mm @ f11, exposure of 30 seconds.

These were made using my 35mm film camera and are one exposure only. No time-wasting experimentation or making 2 or 3 exposures. No preview either. Compose. Focus. Expose. Then on to the next one.

You'll quickly see the advantage of your f1.8 lens when you look at the Scene 'Domestic interiors at night, subject lit by campfire or bonfire' and scroll down the aperture/shutter speed suggestions. Unfortunately the chart doesn't have f1.8 so you'll have to do a little extra work because f1.4 is 2/3 stop faster than f1.8. Here is a link to a chart showing ISO, shutter speeds and f-stops in whole, 1/2 and 1/3 stop increments.
http://www.photographyuncapped.com/articles/photography/iso-shutter-speeds-f-stops/

So if you use the Scene 'Domestic interiors… ' and, for instance, ISO 800 you'll see a shutter speed of 1/125 sec. At f1.4 and by referring to the ISO, shutter speed, f-stop chart you'll see that a 1/80 sec.shutter speed is 2/3 stop slower than 1/125 sec.