Incorrect date format for Finnish Biblatex bibliography

Question

I'm writing my bachelor's thesis in the Finnish language. We are provided with a template that can be used, and I'm going off it. It's my first time using LaTeX and basically all the complicated things the template does are magic to me.

The problem I'm having is that urldate comes out grammatically incorrect to the bibliography.
Take this example:

@online{test,
  author = {An Author},
  title = {This is the title},
  url = {https://www.url.com/},
  year = {2023},
  urldate = {2023-04-15}
}

I'm using the APA style that is provided by the template, so this comes out to the bibliography as:
Author, A. (2023). This is the title. Haettu huhtikuuta 15, 2023, osoitteesta https://www.url.com/
However, Haettu huhtikuuta 15, 2023 is grammatically incorrect and it should be Haettu 15. huhtikuuta, 2023. Or perhaps even more preferably Haettu 15.4.2023.

Is there something I can do to fix this grammatical error? To me it seems like these translations/formatting just come from some package that is specified in the tauthesis.cls file. Would it need to be fixed upstream somewhere?

---

EDIT:
As per @CarLaTeX's comment, currently the problem is fixed to the point, that the bibliography text is very close to being grammatically correct. Now only the comma (,) after the urldate needs to be get rid of here:

Here is a "minimal" _{^{(sorry, not so minimal, I don't know what all I can remove from the template without breaking it)}} example of what I'm working with:
https://www.overleaf.com/read/thvfdcfwgkxh

Answer 1

You modified tauthesis.cls changing \ExecuteOptions{finnish,numeric} to \ExecuteOptions{finnish,apa}.

You could also add urldate=short when BiBLaTeX is required:

\RequirePackage
    [backend=biber,
    autolang=other,
    urldate=short,
    citestyle=\@citationstyle,
    bibstyle=\@citationstyle]{biblatex}

After doing it, your citation will appear this way:

\begin{filecontents}[overwrite]{references.bib}
@online{test,
  author = {An Author},
  title = {This is the title},
  url = {https://www.url.com/},
  year = {2023},
  urldate = {2023-04-15}
}
\end{filecontents}
\pdfminorversion=6
\documentclass{tauthesis}
\usepackage{amsmath, amssymb, amsthm}
\newcommand{\verbcommand}[1]{\texttt{\textbackslash #1}}
\makeglossaries
\addbibresource{references.bib}
\begin{document}
Test citation \cite{test}.
\printbibliography[heading=bibintoc]
\end{document}

EDIT:
Redefining urldate:

\begin{filecontents*}[overwrite]{references.bib}
@online{test,
  author = {An Author},
  title = {This is the title of some cool site},
  url = {https://www.url.com/},
  year = {2023},
  urldate = {2023-04-15}
}
@online{test2,
  author = {An Authorr},
  title = {Why doesn't this also wrap incorrectly},
  subtitle = {so weird, I cant replicate},
  url = {https://www.url.com/this-a-long-url-yeah-yeah-yeah-yeah.html},
  year = {2023},
  urldate = {2023-04-15}
}
@online{SOAPvsREST,
  author = {Alyssa Walker},
  title = {SOAP vs REST API},
  subtitle = {Difference Between Web Services},
  url = {https://www.guru99.com/comparison-between-web-services.html},
  year = {2023},
  urldate = {2023-04-10}
}
\end{filecontents*}
\begin{filecontents}[overwrite]{\jobname.xmpdata}
\Title{test}
\Author{test}
\Language{fi}
\end{filecontents}
\pdfminorversion=6
\documentclass{tauthesis}
\usepackage{amsmath, amssymb, amsthm}
\usepackage{hyperref}
\hypersetup{hidelinks}
% float placement
\usepackage{float}
% svg support
\usepackage{svg}
% landscape support
\usepackage{lscape}
% long table support
\usepackage{longtable}
% checkmark and x mark support from pifont's dingbats
\usepackage{pifont}
\newcommand{\cmark}{\ding{51}}%
\newcommand{\xmark}{\ding{55}}%
%%%%% Your commands.
% added: 
\usepackage{microtype}
% Print verbatim LaTeX commands
\newcommand{\verbcommand}[1]{\texttt{\textbackslash #1}}
\makeglossaries
% added:
\DefineBibliographyStrings{finnish}{%
    urlseen = {Haettu\addspace},%
    urlfrom = {osoitteesta\addspace},%
}
% added (thanks to moewe):
\DeclareFieldFormat{urldate}{\bibstring{urlseen}~#1\space\bibstring{urlfrom}}
\renewbibmacro*{url+urldate}{%
  \usebibmacro{urldate}%
  \setunit{\addspace}%
  \usebibmacro{url}%
}
\DefineBibliographyExtras{finnish}{%
 % d-m-y format for short dates
  \protected\def\mkbibdateshort#1#2#3{%
    \iffieldundef{#3}
      {}
      {\thefield{#3}%
       \iffieldundef{#2}{}{.}}%
    \iffieldundef{#2}
      {}
      {\thefield{#2}%
       \iffieldundef{#1}{}{.}}%
    \iffieldbibstring{#1}{\bibstring{\thefield{#1}}}{\mkyearzeros{\thefield{#1}}}}%
}
% added:
\renewcommand*{\finentrypunct}{}
\addbibresource{references.bib}
\begin{document}
\chapter{test}
\cite{test}
\cite{test2}
\cite{SOAPvsREST}
\printbibliography[heading=bibintoc]
\end{document}

For the text that goes out of margins, you can load microtype package.

To remove the dot at the end you can use:

\renewcommand*{\finentrypunct}{}

but it will remove the final dot for all the entries.