A date, for example 29 August 2008. Only valid dates are allowed (for example, 30 February 2000 is not allowed).
Dates can be entered in expressions using the date{} syntax, for example: date{29 August 2008}.
To avoid confusion over whether the day or month comes first, this type converts to text using the ISO 8601 standard of YYYY-MM-DD, so 29 August 2008 is written 2008-08-29.
This type has no time or timezone attached.