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iso-8601-date ISO-8601 Formatted Date

A machine-processable, ISO 8601 formatted date value (“YYYY-MM-DDThh:mm:ss”) for a JATS date-specific element, whether the content of the date be specified as text, an ISO date, a partial date, or as any other date format. If the date given in the content of the element is in a non-Gregorian calendar, this attribute can hold the Gregorian calendar equivalent of that date.

Usage/Remarks

The ISO date format (“YYYY-MM-DDThh:mm:ss”) may be used, for example, to add processable numeric month value and day values to a date element given in the text form: “January 24, 2021”: 
  <date-in-citation specific-use="access-date" 
      iso-8601-date="2021-01-24">January 24, 2021</date-in-citation>
The hours, minutes, and seconds of the @iso-8601-date values may be used to include a timestamp for a date, for example, when a publication date has both an embargo date and an embargo time.
OPTIONAL on many elements; click for list and usage

<access-date>, <article-version>, <conf-date>, <date>, <date-in-citation>, <string-date>, <year>

Value Meaning
Text, numbers, or special characters The ISO 8601 standard date format (“YYYY-MM-DDThh:mm:ss”) for the date given in the element, for example, “2015-07-15”.
Restriction @iso-8601-date is an optional attribute; there is no default.
Tagged Sample

Presenting a publication date in ISO 8601 format for a bibliographic citation

...  
<ref id="B14">
 <element-citation publication-type="book" publication-format="print">
  ...
  <source>A new kind of doctor: the general practitioner&rsquo;s 
   part in the health of the community</source>
  <date iso-8601-date="1988" date-type="pub">
   <year>1988</year></date>
  <publisher-loc>London</publisher-loc>
  <publisher-name>Merlin Press</publisher-name>
 </element-citation>
</ref>
...