"Last-modified" Formats

This is an exploratory page to document formats used for indicating the

• "last-modified" date
• "published" date

Author

• Robert Bachmann

Formats

"Last-modified" formats

• Atom
  • http://www.atomenabled.org/developers/syndication/atom-format-spec.php#rfc.section.4.2.15 (“atom:updated” element)
  • notice that this is a user-defined value
• Dublin core
  • http://dublincore.org/documents/dcmi-terms/#modified (“modified” term)
• HTML 4.01
  • The INS and DEL elements http://www.w3.org/TR/html401/struct/text.html#edef-ins
• HTTP 1.1
  • RFC 2616: Last-Modified Header (p. 134)
  • notice that this can be a user defined value
• iCalendar
  • RFC 2445: 4.8.7.3 Last Modified (p. 129f)
  • notice that this is a machine-defined value
• RSS
  • 2.0
    • http://blogs.law.harvard.edu/tech/rss#optionalChannelElements (“lastBuildDate” element)
  • 1.0
    • http://web.resource.org/rss/1.0/modules/syndication/ (“updateBase” element)
• vCard
  • RFC 2426: 3.6.4 REV Type Definition (p. 22)

"Published" and "Created" formats

• Atom
  • http://www.atomenabled.org/developers/syndication/atom-format-spec.php#rfc.section.4.2.9 (“atom:published” element)
• Dublin core
  • http://dublincore.org/documents/dcmi-terms/#date (“date” term)
  • http://dublincore.org/documents/dcmi-terms/#created (“created” term)
• HTML 4.01
  • http://www.w3.org/TR/html401/struct/global.html#profiles (fictional profile)
• iCalendar
  • RFC 2445: 4.8.7.2 Date/Time Stamp (p. 129f)
    • this property actually means "created," not "published"
• RSS
  • 2.0
    • http://blogs.law.harvard.edu/tech/rss#ltpubdategtSubelementOfLtitemgt (“pubDate” element; child of <item>)
    • http://blogs.law.harvard.edu/tech/rss#optionalChannelElements (“pubDate” element; child of <channel>)

Related

• ← last-modified-examples
• → last-modified-brainstorming
• datetime-design-pattern