Extends
A date-time is an instant as an RFC 3339 / ISO 8601 string: YYYY-MM-DDTHH:MM:SS[.sss]Z, or the same with a numeric offset (for example 2026-08-26T14:30:00Z). It refines string with format: date-time, so an editor shows a date-and-time picker, and with a pattern that checks the shape.
This page describes the date-time type, a value type of Hypermedia Schemas. Its formal schema is attached as the schemaDefinition in this document's metadata, so the app can show it and create values of this type.
See also
date: a calendar date without a time.
timestamp: the Unix-millisecond time inside blobs.
string: the underlying kind.
Scalar schema: how format and patterns refine a string.
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