Quite often, when developing an API, there is a need to work with time, the most popular input data format with this approach is ISO 8601 ( 2018-11-13T20:20:39+00:00), it would be great to add validation support for this format out of the box. This format supports the JSON Schema specifications and is called 'date-time', there are also two additional formats for 'time' and 'date', since in this case 'date' is already occupied, we can use the 'date-time' type, under which all three JSON Schema formats will fit, or call type 'date' as 'date-string'.
If support for this format has already been implemented and I just haven't found it, I apologize.