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Is it possible to add some information about the day of publication in biblatex? Is it also possible to make double month entries with biblatex?

The bibtex entries


do fine with bibtex, but they don't work with biblatex.

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Please note that you can format source-code blocks by adding 4 whitespaces in front of each line, or simply selecting it and clicking the "code" {} button. – T. Verron Nov 28 '12 at 18:45
up vote 6 down vote accepted

Fot the day of publication you can use the date field. A date can be specified YYYY-MM-DD or using a date range YYYY-MM-DD/YYYY-MM-DD months and days are optional.

For the other issues, how to specify double month entires, the best option is to use either issue or number. Here are the relevant extracts from the biblatex manual:

issues (literal)
The issue of a journal. This field is intended for journals whose individual issues are identified by a designation such as ‘Spring’ or ‘Summer’ rather than the month or a number. Since the placement of issue is similar to month and number, this field may also be useful with double issues and other special cases. See also month, number, and § 2.3.9.

month (integer)
The publication month. This must be an integer, not an ordinal or a string. Don’t say month={January} but month={1}. The bibliography style converts this to a language dependent string or ordinal where required. See also date as well as §§ 2.3.9 and 2.3.8.

number (literal)
The number of a journal or the volume/number of a book in a series. See also issue as well as §§ 2.3.7 and 2.3.9. With @patent entries, this is the number or record token of a patent or patent request.


When biblatex is used with biber, then one can use the \DeclareSourcemap feature to "transform" the entries and the field in a .bib file in place. Here is a definition of the source map for the given format of month.

        fieldset=number, origfieldval]
        fieldset=day, fieldvalue={$2}]
        match=\regexp{(\d\d)\d*}, replace=\regexp{$1}]
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Thanks the quick answer. With the 'date'-field it works as intended, but it is still a slow workaround, because the most citations I use come from databases with bibtex-style-entries, so I have to change each citation manually. It takes a lot of time to rebuild a list of 100 citations. – d di Nov 28 '12 at 23:06
You can use the sourcemap features of biber to automate that. Do you have the data in the month field? and is the format the one in the question? – Guido Nov 29 '12 at 0:21
All tha data is in the 'month'-field and has the structure, given above month=mar#"/"#apr, month=mar#"15" or month=mar. There is no 'date'-field in the original bibtex-files. – d di Nov 29 '12 at 21:05
@ddi revised the definition of \DeclareSourcemap according to the given format. – Guido Nov 30 '12 at 10:47

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