The BEST way to do DfN is to shoot in B&W with a red filter over the lens to darken down the sky. In color, people have used any number of blue, ND or other filters to darken or tint the footage, but it always tends to look fake, even on big budget, A list productions.
If you HAVE to shoot it during the daytime, you might be able to use a good colorist &/or compositor to help sell the effect by darkening down background areas, replacing sky, etc.
Arnie
https://www.arniepix.com