A date string, such as
2007-12-03, is compliant with the
full-date format outlined in section 5.6 of the RFC 3339
profile of the ISO 8601 standard for the representation of dates and times using the Gregorian calendar.
This scalar is a description of the date, as used for birthdays for example. It cannot represent an instant on the timeline.
When expected as an input type, only RFC 3339 compliant date strings are accepted. All other input values raise a query error indicating an incorrect type.