Key:date
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 date
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| Description |
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Date when related event happened (memorials), or is a clock showing the current date in addition to showing time. 
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| Group: properties |
| Used on these elements |
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| Useful combination |
| Status: in use |
| Tools for this tag |
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Date when related event happened historic=* (Status: in use) / Does a clock amenity=clock also show the current date? (Status: "approved" 
).
This tag was also heavily used for other, unknown reasons (for example date=2014 added to most minor roads in one rectangle in Mexico)
Some uses by mappers included specifying date when feature was mapped.
Formatting
historic=*
Dates use the ISO 8601 system, which is based on the Gregorian calendar.
Examples:
- 2010 ; where the year is known, but no more
- 0897 (for 897 AD)
- 1848-07 ; where the year and month are known
- 2010-03-31 ; for where the full date is known, using the format yyyy-mm-dd
Caution: ISO8601 uses the format yyyy-mm-dd, not the common North American model of mm-dd-yyyy
amenity=clock
See also: Proposal:Clock
date=yes– The clock also shows the current date. Default value: nodate=no– The clock does not show the current date.
See also
start_date=*- Date when feature opened or the construction of the feature finished