OpenHistoricalMap/Tags/Key/end_date:edtf

end_date:edtf
Description
Approximate or uncertain date when the feature went out of existence.
Group: lifecycle
Used on these elements
Requires
end_date=*
Useful combination
start_date:edtf=*
Status: de facto
end_date:edtf=* More details at taginfo
Tools for this tag
overpass-turbo OSM Tag History

This subkey of end_date=* qualifies the feature's end date in the Extended Date Time Format, a profile of ISO 8601 that supports times of day, uncertainty, approximation, and seasons.

How to tag

Tag the EDTF end date in end_date:edtf=*. For backwards compatibility, also set end_date=* to the most accurate date that can be expressed in that key's more rigid YYYY-MM-DD format. Do not set end_date=* to OpenStreetMap's approximations syntax. OHM rejects this syntax in favor of EDTF in end_date:edtf=*.

Examples

• 

  Year only
  "1272":
  end_date=1272
  end_date:edtf=1272

• 

  Date and time
  "October 4 [2011] at 5:00 PM":
  end_date=2011-10-04
  end_date:edtf=2011-10-04T05:00

• 

  Circa; around; on or about
  "circa 1871":
  end_date=1871
  end_date:edtf=1871~

• 

  Mid-century (as a "circa")
  "the mid sixteenth century":
  end_date=1550
  end_date:edtf=1550~

• 

  A decade / unknown year
  "1960s":
  end_date=1960
  end_date:edtf=196X

• Placeholder statement

  A century / unknown year & decade
  "15th Century":
  end_date=1450
  end_date:edtf=14XX

• 

  Between
  "between 1908 and 1909":
  end_date=1908
  end_date:edtf=1908/1909 or [1908..1909]

• 

  "Early" (as a "between")
  "the early 1840s":
  end_date=1840
  end_date:edtf=1840/1845

• 

  Season
  "the winter of 1940":
  end_date=1940
  end_date:edtf=1940-24

• 

  Indefinite date
  "for almost 90 years [since 1910]":
  end_date=2000
  end_date:edtf=/2000 or [..2000]

• Placeholder map

  "As of" as an "on or before"
  a different building shown on 1935 map
  end_date=1935
  end_date:edtf=/1935 or [..1935]

Software support

In iD, you can click the button in the End Date field to set an EDTF date. iD validates this date and will warn if it is malformed or the end_date=* falls outside the range of possible dates described by the EDTF date. If the end_date=* is expressed in OSM's "approximations" format, iD will flag it as an invalid date and offer to replace it with the equivalent end_date:edtf=* tag in EDTF format.

No renderer has built-in support for EDTF dates yet.

See also

• start_date:edtf=*
• Open Historical Map/Dates And Times
• Open Historical Map/Tags/Proposed/Tag:start date=datespec

External links

• Extended Date/Time Format (EDTF) Specification