From OpenStreetMap Wiki
Jump to navigation Jump to search
Public-images-osm logo.svg check_date
Check mark.svg
Date of latest review of the data Edit this description in the wiki page. Edit this description in the data item.
Group: Properties
Used on these elements
may be used on nodesmay be used on waysmay be used on areasmay be used on relations
Useful combination
See also
Status: in use

The tag check_date=* is used:

  • to document the date when the existence of an object was last checked and
  • as a prefix, e.g. in check_date:opening_hours=*, to document when a specific tag was last checked. This is particularily useful for tags with information that change often, such as opening_hours=* or collection_times=*.

The date should be specified using the  ISO 8601 format YYYY-MM-DD.


A road that was still under construction on 2 June 2021:


A road under construction whose planned opening date (5 October 2021) has been checked on 2 June 2021:


A postbox that still existed on 21 September 2021 but whose collection times have probably not been checked since 13 May 2021:

collection_times=Mo-Fr 09:00


  • The original idea was to use check_date=* to document the date when an object as a whole (i.e. all its tags) have last been checked. However, it was also used to indicate only a partial survey. It has then been used used by StreetComplete (and possibly by others) to document the date when only its existence was last checked due to it often being impractical to check all tags of an object.[1]
  • check_date is also used as a suffix (e.g. in collection_times:check_date=* or opening_hours:check_date=*), but much less than as a prefix.[2][3]

Synonymous tags in use

There are a number of other tags in use for documenting the date of a survey or update. Apparently there is no clear consensus as yet on which tag to use. You should try to use check_date=* or other of those tags that others have already used for the same purpose to avoid creating new duplicates. Do note, however, that not all of the tags listed here mean exactly the same thing.

See also