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<day> Day

Numeric, two-digit value of the day of the month.

Usage/Remarks

The <day> element names a day of the month, in two-digit form as it would be stated as the “DD” in the international date format YYYY-MM-DD (for example, “03” for the third, “25” for the twenty-fifth).
Used in both the article metadata (<article-meta>) and within bibliographic references (<element-citation> and <mixed-citation>).
Related Elements
Within citations (<element-citation> and <mixed-citation>), this element names a day, typically for the publication date of the cited source. The elements <year>, <date>, <day>, <month>, and <season> may all be used to describe a date in a citation, both publication dates and other dates. Other dates inside a citation, such as a copyright date, the date on which the author accessed the resource, or a withdrawal date, should be tagged using <date-in-citation> with the @content-type attribute used to name the type of date (copyright, access-date, time-stamp, etc.).
Attributes
content-type
specific-use

Base Attributes

id
xml:base
xml:lang
Models and Context
May be contained in
<access-date>, <conf-date>, <date>, <date-in-citation>, <element-citation>, <mixed-citation>, <nlm-citation>, <product>, <pub-date>, <related-article>, <related-object>, <std>, <string-date>, <time-stamp>
Description
Text, numbers, or special characters
Content Model
<!ELEMENT  day          (#PCDATA)                                    >
Tagged Samples
In <history> 
...
<article-meta>
 ...
 <contrib-group>
  <contrib contrib-type="author">
   <collab collab-type="committee">Technical Committee ISO/TC 108, 
    Subcommittee SC 2</collab>
  </contrib>
 </contrib-group>
 <fpage seq="1">1</fpage>
 <lpage>23</lpage>
 <history>
  <date date-type="approved" iso-8601-date="2012-06-01">
   <day>01</day>
   <month>06</month>
   <year>2012</year>
  </date>
 </history>
 ...
</article-meta>
...
In <pub-date> and <history> 
...
<article-meta>
 <article-id pub-id-type="pmid">...</article-id>
 <title-group>...</title-group>
 <contrib-group>...</contrib-group>
 <aff id="StLukes">...</aff>
 <pub-date publication-format="print" date-type="pub" 
   iso-8601-date="1999-03-27">
  <day>27</day>
  <month>03</month>
  <year>1999</year>
 </pub-date>
 <volume>318</volume>
 <issue>7187</issue>
 <fpage>837</fpage>
 <lpage>841</lpage>
 <history>
  <date date-type="accepted" iso-8601-date="2001-01-29">
   <day>29</day>
   <month>01</month>
   <year>1999</year>
  </date>
 </history>
 <permissions>
  <copyright-statement>Copyright &#x00A9; 1999, British
   Medical Journal</copyright-statement>
  <copyright-year>1999</copyright-year>
  <copyright-holder>British Medical Journal</copyright-holder>
 </permissions>
 <abstract>
  <p>To examine the effectiveness of day hospital
   attendance in prolonging independent living for
   elderly people.</p>
 </abstract>
</article-meta>
...
Publication date in citations
Mixed citation
...
<ref>
 <mixed-citation publication-type="book" publication-format="web">
  <source>Fact sheet: AIDS information resources</source>
  [Internet]. <publisher-loc>Bethesda
  (MD)</publisher-loc>: <publisher-name>National
  Library of Medicine (US)</publisher-name>;
  <year iso-8601-date="2003-05-02">2003</year> <month>May</month>
  <day>2</day> [updated <date-in-citation content-type="updated"
  iso-8601-date="2005-07-14">2005 Jul 14</date-in-citation>;
  cited <date-in-citation content-type="access-date"
  iso-8601-date="2006-11-15">2006 Nov 15</date-in-citation>].
  <size units="screens">[about 3 screens]</size>. Available from:
  <uri>http://www.nlm.nih.gov/pubs/factsheets/aidsinfs.html</uri>.
 </mixed-citation>
</ref>
...
Element citation
...
<ref>
 <element-citation publication-type="book" publication-format="web">
  <source>Fact sheet: AIDS information resources</source>
  <comment>[Internet]</comment>
  <publisher-loc>Bethesda (MD)</publisher-loc>
  <publisher-name>National Library of Medicine (US)</publisher-name>
  <year iso-8601-date="2002-05-02">2003</year>
  <month>May</month>
  <day>2</day>
  <date-in-citation content-type="updated"
    iso-8601-date="2005-07-14">updated 2005 Jul 14</date-in-citation>
  <date-in-citation content-type="access-date"
    iso-8601-date="2006-11-15">cited 2006 Nov 15</date-in-citation>
  <size units="screens">[about 3 screens]</size>
  <comment>Available from:
   <uri>http://www.nlm.nih.gov/pubs/factsheets/aidsinfs.html</uri>
  </comment>
 </element-citation>
</ref>
...
Related Resource
For a discussion on the use of <day>, see Dates in Citations.