I use the authoryear citestyle, but I don't want it to print the year when citing an online source (but I do want the date in the bibliography).
biber version is 2.7
\documentclass[a4paper,10pt]{article}
\usepackage[utf8]{inputenc}
\usepackage[backend=biber, citestyle=authoryear]{biblatex}
\usepackage{filecontents}
\begin{filecontents}{\jobname.bib}
@online{stackexchange,
author = "{StackExchange}",
title = {Tex StackExchange},
url = {tex.stackexchange.com},
urldate = {2017-12-10}
}
\end{filecontents}
\addbibresource{\jobname.bib}
\begin{document}
StackExchange is a Website\autocite{stackexchange}.
\end{document}