Printing day-month only in bibliography (in authoryear style)

Question

I am struggling to re-create the format required for the bibliography in a variation of the Harvard style. This is an example of an online article:

Elliott, L. (2008) Economic slowdown and tax breaks put the government in the red. Guardian [Internet], 20 November. Available from: <http://www.guardian.co.uk/business> [Accessed 19 November 2007].

Using the minimal example below, I manage to create the following:

Elliott, L. (2008). Economic slowdown and tax breaks put the government in the red. Guardian. [Internet] (20th Nov. 2008). Available from: <http://www.guardian.co.uk/business> [Accessed 19th Nov. 2017].

Looking at the differences, I have a few questions:

1. How to print the date in day-month format as shown without the year and the surrounding parentheses?
2. How to remove the periods after the label year and after the journal name?
3. How to connect the journal and the date with a comma?

Here is a minimal example:

\begin{filecontents}{test.bib}
@article{test,
  author = {L. Elliott},
  title = {Economic slowdown and tax breaks put the government in the red},
  journal = {Guardian},
  date = {2008-11-20},
  url = {http://www.guardian.co.uk/business},
  urldate = {2017-11-19}
}
\end{filecontents}

\documentclass{article}
\usepackage{times}
\usepackage{csquotes}
\usepackage[british]{babel}
\usepackage[
  style=authoryear,
  mergedate=false,
  urldate=long
]{biblatex}
\addbibresource{test.bib}

\NewBibliographyString{available}
\NewBibliographyString{internet}
\DefineBibliographyStrings{english}{%
  urlseen = {Accessed},
  available = {Available from},
  internet = {[Internet]}
}
\DeclareFieldFormat[article]{title}{#1}
\renewbibmacro{in:}{}
\DeclareFieldFormat[article]{journaltitle}{\textbf{#1}\space\bibstring{internet}}
\DeclareFieldFormat{url}{\bibstring{available}\addcolon\space$<$\url{#1}$>$}
\DeclareFieldFormat{urldate}{\mkbibbrackets{\bibstring{urlseen}\space#1}}
\urlstyle{same}

\begin{document}
\nocite{*}
\printbibliography
\end{document}

Answer 1

For the main part of your question (the month-day-only date) you need to define a new date format. That is necessary because the standard date formats always check if a year is present: They won't print anything if there is no year. So we can't simply say \clearfield{year}\printdate and enjoy a date without year. The code below implements the two ned date formats daymonthlong and daymonthshort based on the long and short date formats. Output for date ranges will likely be confusing or outright wrong.

The other two issues are fairly boring changes to standard macros. See the code below.

%\RequirePackage{filecontents}
\begin{filecontents}{\jobname.bib}
@article{test,
  author = {L. Elliott},
  title = {Economic slowdown and tax breaks put the government in the red},
  journal = {Guardian},
  date = {2008-11-20},
  url = {http://www.guardian.co.uk/business},
  urldate = {2017-11-19}
}
\end{filecontents}

\documentclass{article}
\usepackage{csquotes}
\usepackage[british]{babel}
\usepackage[
  style=authoryear,
  mergedate=false,
  urldate=long,
  dateabbrev=false,
]{biblatex}
\addbibresource{\jobname.bib}

\NewBibliographyString{available}
\NewBibliographyString{internet}
\DefineBibliographyStrings{english}{%
  urlseen = {Accessed},
  available = {Available from},
  internet = {[Internet]}
}
\DeclareFieldFormat[article]{title}{#1}
\renewbibmacro{in:}{}
\DeclareFieldFormat[article]{journaltitle}{\textbf{#1}\setunit{\space}\bibstring{internet}}
\DeclareFieldFormat{url}{\bibstring{available}\addcolon\space$<$\url{#1}$>$}
\DeclareFieldFormat{urldate}{\mkbibbrackets{\bibstring{urlseen}\space#1}}


\renewbibmacro*{issue+date}{%
  \printfield{issue}%
  \setunit*{\addspace}%
  \usebibmacro{date}%
  \newunit}

\makeatletter
\newrobustcmd*{\mkdaterangedaymonth}[2]{%
  \begingroup
    \blx@metadateinfo{#2}%
    \iffieldundef{#2year}
      {}
      {\printtext[#2date]{%
         \datecircaprint
         % Such a season component can only come from an ISO8601 season which replaces
         % a normal month so if it exists, we know that a normal date print is ruled out
         \iffieldundef{#2season}
           {\csuse{mkbibdate#1}{}{#2month}{#2day}%
            % Optionally print the time after the date
            \blx@printtime{#2}{}}
           {\csuse{mkbibseasondate#1}{}{#2season}}%
         \dateuncertainprint
         \dateeraprint{#2year}%
         \iffieldundef{#2endyear}
           {}
           {\iffieldequalstr{#2endyear}{}
              {\mbox{\bibdaterangesep}}
              {\bibdaterangesep
               \enddatecircaprint
               \iffieldundef{#2season}
                 {\csuse{mkbibdate#1}{#2endyear}{#2endmonth}{#2endday}%
                  % Optionally print the time after the date
                  \blx@printtime{#2}{end}}
                 {\csuse{mkbibseasondate#1}{#2endyear}{#2endseason}}%
               \enddateuncertainprint
               \dateeraprint{#2endyear}}}}}%
  \endgroup}

\newcommand*{\mkdaterangedaymonthlong}{\mkdaterangedaymonth{long}}
\newcommand*{\mkdaterangedaymonthshort}{\mkdaterangedaymonth{short}}
\makeatother

\ExecuteBibliographyOptions{date=daymonthlong}

\DeclareDelimFormat[bib,biblist]{nametitledelim}{\addspace}

\renewbibmacro*{journal+issuetitle}{%
  \usebibmacro{journal}%
  \setunit*{\addspace}%
  \iffieldundef{series}
    {}
    {\newunit
     \printfield{series}%
     \setunit{\addspace}}%
  \usebibmacro{volume+number+eid}%
  \setunit{\addcomma\space}%
  \usebibmacro{issue+date}%
  \setunit{\addcolon\space}%
  \usebibmacro{issue}%
  \newunit}

\begin{document}
\nocite{*}
\printbibliography
\end{document}