# Manually break biblatex entry like date or number

I am running Biblatex with Biber and TexnicCenter with Miktex. How do I manually break the date or put it on the next line if it is at the end of an entry (ISO 8601, has to be broken or on a new line)? Same goes for the number for patents? In this MWE the patent number does not break, but in my main document the main issue is with the date, e. g. 2014-06-16. Thank you very much!

Edit: Made the outer margin a bit larger and added two examples.

\documentclass[12pt,a4paper,draft]{scrartcl}

\usepackage[ngerman]{babel}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}

\usepackage{geometry}
\geometry{a4paper, top=29mm, inner=30mm, outer=25mm, bottom=30mm,

\usepackage{csquotes}
\usepackage{microtype}
\usepackage{textcomp}
\usepackage[backend=biber,
style=numeric-comp,
sorting=none,
maxnames=3,
minnames=3,
language=ngerman,
hyperref=true,
date=iso8601,
arxiv=ps,
texencoding=utf8,
bibencoding=utf8,
firstinits=true,
terseinits=false,
useprefix=true,
]{biblatex}

\DeclareFieldFormat[article,inbook,incollection,inproceedings,patent,unpublished]{title}{#1}
\DeclareFieldFormat[thesis,book,inproceedings,patent]{title}{\emph{#1}}

\begin{document}

\cite{PatentLeistungsschutzschalter, FGLBeispielAntenne, FGLBeispielChirugie}

\printbibliography

\end{document}

@Patent{PatentLeistungsschutzschalter,
Title                    = {Leitungsschutzschalter},
Author                   = {{BBC Brown Boveri Cie, Niemeyer, L.}},
Date                     = {1979-11-05},
Number                   = {DE2944579A1},
Type                     = {Patentschrift},
}

@Online{FGLBeispielChirugie,
Title                    = {Nitinol Führungsdrähte für PiCCO-Katheter},
Author                   = {{Pulsion Medical Systems}},
Date                     = {2013-07-05},
}

@Online{FGLBeispielAntenne,
Title                    = {Leitfaden für HF-Entwickler - Antennenmaterial},
Author                   = {{Circuit Design GmbH}},
Date                     = {2013-07-05},
Url                      = {http://www.circuitdesign.de/products/tech_info/guide3.asp},
}

• not relevant to the question, but i believe that "Brown Boveri" is misspelled. regarding not breaking a date at hyphens, i'd be inclined (depending on the rest of the bibliography) to set it ragged right, and suppress all hyphens, including explicit ones (using \exhyphenpenalty=10000). – barbara beeton Jun 16 '14 at 14:50
• Can you come up with an MWE where the date is actually broken, because it seems LaTeX is very very reluctant to do so (I could not make it do so). Or do I misunderstand your question. – moewe Jun 16 '14 at 15:10
• Edited my MWE for better understanding – Hans Oberlander Jun 16 '14 at 15:31
• You could, as barbarabeeton suggests use block=ragged. – moewe Jun 16 '14 at 15:43
• Why is block=ragged not acceptable if you want line breaks. – moewe Jun 17 '14 at 17:22

You can add extra formatting to a field in the .bib file by either adding

• \allowbreak, to allow a line break, or
• \hyphenate (from the biblatex package), to add an optional hyphen:

Literatur.bib

@Patent{PatentLeistungsschutzschalter,
Title                    = {Leitungsschutzschalter},
Author                   = {{BBC Brown Boveri Cie, Niemeyer, L.}},
Date                     = {1979-11-05},
Number                   = {DE\allowbreak 2944\allowbreak 579A1},
Type                     = {Patentschrift},
}

@Patent{PatentLeistungsschutzschalter2,
Title                    = {Leitungsschutzschalter},
Author                   = {{BBC Brown Boveri Cie, Niemeyer, L.}},
Date                     = {1979-11-05},
Number                   = {DE\hyphenate 2944\hyphenate 579A1},
Type                     = {Patentschrift},
}

@Online{FGLBeispielChirugie,
Title                    = {Nitinol Führungsdrähte für PiCCO-Katheter},
Author                   = {{Pulsion Medical Systems}},
Date                     = {2013-07-05},
}

@Online{FGLBeispielAntenne,
Title                    = {Leitfaden für HF-Entwickler - Antennenmaterial},
Author                   = {{Circuit Design GmbH}},
Date                     = {2013-07-05},
Url                      = {http://www.circuitdesign.de/products/tech_info/guide3.asp},
}


LaTeX file:

\documentclass[12pt,a4paper,draft]{scrartcl}

\usepackage[ngerman]{babel}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}

\usepackage{geometry}
\geometry{a4paper, top=29mm, inner=30mm, outer=25mm, bottom=30mm,

\usepackage{csquotes}
\usepackage{microtype}
\usepackage{textcomp}
\usepackage[backend=biber,
style=numeric-comp,
sorting=none,
maxnames=3,
minnames=3,
language=ngerman,
hyperref=true,
date=iso8601,
arxiv=ps,
texencoding=utf8,
bibencoding=utf8,
firstinits=true,
terseinits=false,
useprefix=true,
]{biblatex}