ISO-8601 Formatted Date

A machine-processable, ISO 8601 formatted date (“YYYY-MM-DDThh:mm:ss”) value for a date that may be specified as text, as a partial date, or as any other date format that cannot be guaranteed to be machine-processable.


The ISO date format : “YYYY-MM-DDThh:mm:ss” may be used, for example, to add a numeric value, such as “01” to a <month> element with a value of “January”. In addition, the hours, minutes, and seconds 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.

Attribute Values

In Elements

<conf-date>, <date>, <date-in-citation>, <pub-date>, <string-date>, <year>
Text, numbers, or special characters.The ISO 8601 standard date format for the date given in the element: “YYYY-MM-DDThh:mm:ss”.
Restriction: This is an optional attribute; there is no default.