Key:check_date

check_date
Description
Date of latest review of the data
Group: Properties
Used on these elements
Useful combination
opening_date=* opening_hours=* collection_times=*
See also
survey:date=* source:date=*
Wikidata
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Status: unspecified
Tools for this tag
taginfo · CH · CZ · FR · GB · HU · IE · IN · JP · PL overpass-turbo

The tag is intended to document the last date, when an object as a whole or specific tags of the object were checked and verified. This tag may be used with all items where information is subject to change on a regular basis.

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

Examples:

check_date=* used with highway=construction and opening_date=* documents the last time, when the expected opening date was checked or updated.

To indicate the review of specific tags the key is built from multiple words separated by colons like check_date:collection_times=* or check_date:opening_hours=*.

Mapping parties could be run, where critical items with old check dates are surveyed (Example: emergency=defibrillator).

Other 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 consensus as yet on which tag to use. You should try to use one of those tags that others have already used for the same purpose. Do note, however, that not all of the tags listed here mean exactly the same thing.

survey:date=* survey:date=* data: 233.000, last users: 2491 (note that usage is inflated by using it in Antarctica import and is not indicating real usage by humans)	lastcheck=* lastcheck=* data: 6491, last users 262	survey=* survey=* data: 4446, last users: 404
survey_date=* survey_date=* data: 3402, last users: 114	updated=* updated=* data: 2095, last users: 42	last_checked=* last_checked=* data: 1548, last users: 107
operational_status=* operational_status=	operational_status:date=* operational_status:date=	operational_status:note=* operational_status:note=
last_check:date=* last_check:date=	last_check:note=* last_check:note=	last_checked:date=* last_checked:date=
last_checked:note=* last_checked:note=	stateofrepair:note=* stateofrepair:note=	stateofrepair=* stateofrepair=
check_exists:date=* check_exists:date=* used 700 times

The numbers documented here for tag counts and users are based on data from Taginfo (check_date=2016-07-01).

Issues

The last edit date may have been by an armchair mapper, and does not imply a check date. A local mapper may verify some attributes of an object, but not others. In those cases it's important to know what attribute was checked (e.g. existence, temperature, taste, opening hours, repair status).

See also

• Overpass_API/Overpass_API_by_Example#Alternative_that_also_checks_the_syntax_of_the_collection_time - example for QA of amenity=post_box
• source:date=*
• survey:date=*
• Proposed features/changeset_tags
• Proposed features/Second opinion correctness survey
• Proposed features/Tag:operational_status
• Proposed features/last_checked (Abandoned)
• Proposed features/Checked_by (Abandoned)