Swagger dateTime format requires use of the RFC date-time format which is a subset of the ISO Datetime format that does not leave minutes and seconds as optional.

I'm working on APIs for the Travel Industry, where things are never scheduled to the second. Most flights and trains operate to minutes, most car rentals work to the nearest hour. I don't want to compromise my APIs to deliver meaningless minutes and seconds values just to please Swagger.

See https://groups.google.com/forum/#!topic/swagger-swaggersocket/S3ehhOPqink