A time string at UTC, such as 10:15:30Z, compliant with the
full-time 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 a time instant such as the opening bell of the New York Stock Exchange for example. It cannot represent an exact instant on the time-line.
This scalar ignores leap seconds (thereby assuming that a minute constitutes of 59 seconds), in this respect it diverges from the RFC 3339 profile.
Where an RFC 3339 compliant time string has a time-zone other than UTC, it is shifted to UTC. For example, the time string "14:10:20+01:00" is shifted to "13:10:20Z".
When expected as an input type, only RFC 3339 compliant time strings are accepted. All other input values raise a query error indicating an incorrect type.