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Available languages — Key:source:date
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Public-images-osm logo.svg source:date
Osm element key.svg
For indicating the date when the source of information of anything added to the OSM database was taken.
Group: Annotation
Used on these elements
should not be used on nodesmay be used on waysmay be used on areasuse on relations unspecified
Status: Unspecified

What date format should be used?

There is no standing recommendation as to the date format to be used. However, the international standard ISO 8601 appears to be followed by 9 of the top 10 values for this tag. The ISO 8601 basic date format is YYYY-MM-DD .

Looking at the top uses:

  • 6th top use is "201011" (1.8% of all uses) - does this imply "2010/2011" or "2010-11" or "2010-01-01" or "20.10.2011" (was top used value with >55% of all uses)
  • All other 50 top uses all appear to use ISO format dates (these are 2011-03-13, 2009, 2008, 2011-06, 2007, 2011-03-22, 2011-11-06 and 2010-09-17)
  • From there down one see many variations including non-dates, such as the 10th and 11th top uses, "Amtliche Vermessung, Stand 20120423" and "Amtliche Vermessung, Stand 20100428", respectively.

See also