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A birthday is the date when someone is born, however in the context of the indieweb, it is a feature displayed on some silos' user profiles that you can (or must) enter, and some prominently present to your friends on the month and day of your birthday, like Facebook's "BIRTHDAYS THIS WEEK" feature at the top of their events page.

IndieWeb Examples

  • Ashton McAllan on using dt-bday in her h-card on her home page since (????-??-??)
  • Aaron Parecki publishes the month and day of his birthday using dt-bday on his home page h-card since 2016-02
  • Sebastiaan Andeweg added some code to display a cake-emoji next to the profile picture on his main h-card, which also advertises his birthday in mf2, but only on the day itself.
    • <data class="dt-bday" value="--MM-DD">๐ŸŽ‚</data>
  • Martijn van der Ven displays his age and a countdown to his birthday on his website. The countdown, when parsed for microformats gives the time-of-birth as bday exact to the minute.
  • ...

Silo Examples


Facebook has had a birthday field in user profiles since pretty close to the beginning, including separate privacy levels for the date (day & month) and year:



Twitter as of 2015-07-06 has a birthday field in your profile visible just below your "joined" date:


with various privacy levels for the "Year":


Year dropdown privacy menu options:

  • Public
  • My Followers
  • People I Follow
  • We follow each other
  • Only me

On your birthday, when people visit your profile page, balloons fly up from the bottom of the screen:



IndieWebCamp sessions about birthdays:



Birthdays are often used as part of a person's identity and thus publishing a precise accurate birthday pose an identity theft security risk. As a result, people at some IndieWebCamps have self-reported as using non-real birthdays on silos.


Birthdays are often used by social networks to create spurious notifications - see Friendster's line in this video

See Also