# Replace period with colon after year with biblatex to approximate ametsoc guidelines [duplicate]

I'm using `authoryear` with some customisations to give me a bibliography entry like this:

Gal-Chen, T. and R. C. Somerville, 1975. On the Use of a Coordinate Transformation for the Solution of the Navier-Stokes Equations. J. Comp. Phys., 17, 209–228.

In my LaTeX file I use:

``````\usepackage{xpatch}
\usepackage[
backend=biber,
style=authoryear,
firstinits=true,
doi=false,
isbn=false,
uniquename=init]{biblatex}
``````

And I define a `biblatex.cfg` file in the same directory:

``````\renewbibmacro{in:}{}
\AtEveryBibitem{%
\clearfield{number}%
}
\DeclareFieldFormat{pages}{#1}
\DeclareFieldFormat[article]{journaltitle}{\mkbibemph{#1},}
\DeclareFieldFormat[article]{volume}{\textbf{#1}}
\DeclareFieldFormat[article]{title}{#1\isdot}
\xpatchbibmacro{date+extrayear}{%
\printtext[parens]%
}{%
\printtext%
}{}{}
``````

How can I change the period to a colon after the year of publication?

## marked as duplicate by moewe, user31729, Malipivo, Thorsten, JesseJul 5 '14 at 13:35

• If you have not changed too much `\renewcommand*{\labelnamepunct}{\addcolon\space}` should do it. But we really need an MWE to see whether this can help here. – moewe Jun 23 '14 at 19:02