|Expected date of some event - read wiki for precautions|
|Used on these elements|
|Tools for this tag|
An approximated date in the future when a construction will be finished, used on landuse=construction and highway=construction. It is recommended to additionally add check_date=*, which describes the date in the past, when the value of opening_date=* was actually checked.
Format: YYYY-MM-DD (ISO 8601 format)
Avoid combinations such as building=yes + opening_date=future as this would break lots of existing software (see trolltags). This can be avoided by using a lifecycle prefix like construction:building=yes or the specific methods established for roads and railways.
Example: opening_date=2018-11-10 - 10 November 2018
- start_date=* for already completed features