latex night mode

night.tex

% % invert colors for dark view
\usepackage{datetime}
\usepackage{pdftexcmds}
\usepackage{xcolor}
\newcount\minutestart
\newcount\minuteend
\def\giventimestart#1#2#3{\minutestart=#1 \multiply\minutestart by60 \advance\minutestart by#2 }
\def\giventimeend#1#2#3{\minuteend=#1 \multiply\minuteend by60 \advance\minuteend by#2 }

\giventimestart{18}{0}{0}
\giventimeend{10}{0}{0}

\ifnum\time>\minutestart gt
    \pagecolor[rgb]{0.2,0.2,0.2}
    \color[rgb]{1,1,1}
\fi
\ifnum\time<\minuteend lt
    \pagecolor[rgb]{0.2,0.2,0.2}
    \color[rgb]{1,1,1}
\fi