There are several custom styles on CTAN that move the date to the end. biblatex-ieee's style=ieee, biblatex-nature's style=nature and biblatex-phys' style=phys come to mind. Maybe one of those comes close to what you want already.
If you want to modify the standards styles you can either modify the driver or try to trick your way round doing that. In any case redefining a macro pages+year will not help, because this macro does not exist, which means that it is not used at all.
Since modifying the drivers usually takes more code, I will demonstrate a way around that. If I were to write my own style, I would probably modify the driver, though.
First we disable the normal date printing macros and then we insert a new date printing macro into those macros that print the page numbers. Not all entry types have pages, though, so you might end up removing some dates. The code below has a primitive check to avoid that.
\documentclass{article}
\usepackage[style=numeric]{biblatex}
\addbibresource{biblatex-examples.bib}
\newtoggle{bbx:datemissing}
\renewbibmacro*{date}{\toggletrue{bbx:datemissing}%
}
\renewbibmacro*{issue+date}{%
\toggletrue{bbx:datemissing}%
\iffieldundef{issue}
{}
{\printtext[parens]{%
\printfield{issue}}}%
\newunit}
\newbibmacro*{date:print}{%
\togglefalse{bbx:datemissing}%
\printdate}
\renewbibmacro*{chapter+pages}{%
\printfield{chapter}%
\setunit{\bibpagespunct}%
\printfield{pages}%
\newunit
\usebibmacro{date:print}%
\newunit}
\renewbibmacro*{note+pages}{%
\printfield{note}%
\setunit{\bibpagespunct}%
\printfield{pages}%
\newunit
\usebibmacro{date:print}%
\newunit}
\renewbibmacro*{addendum+pubstate}{%
\iftoggle{bbx:datemissing}
{\usebibmacro{date:print}}
{}%
\printfield{addendum}%
\newunit\newblock
\printfield{pubstate}}
\begin{document}
Bla \cite{aksin}
\printbibliography
\end{document}

pages+yearin the standard styles and you should get a warning about that. Redefining the macro therefore changes nothing. Please tell us which style you use in an MWE (https://tex.meta.stackexchange.com/q/228/35864, https://tex.meta.stackexchange.com/q/4407/35864). The solution will definitely depend on that. – moewe May 21 '19 at 11:35