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A date string, such as 2007-12-03, compliant with the full-date format outlined in section 5.6 of the RFC 3339 profile of the ISO 8601 standard for 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 time-line.

Result Coercion

Javascript Date instances are coerced to an RFC 3339 compliant date string. Invalid Date instances raise a field error.

Input Coercion

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.