Intervals

Again part of the ISO 8601 specification is if you need to receive or send an interval you can use the following format:

• Start and end, such as 2007-03-01T13:00:00Z/2008-05-11T15:30:00Z
• Start and duration, such as 2007-03-01T13:00:00Z/P1Y2M10DT2H30M
• Duration and end, such as P1Y2M10DT2H30M/2008-05-11T15:30:00Z
• Duration only, such as P1Y2M10DT2H30M, with additional context information

Find more information on JSON serialization of dates and times at https://github.com/Microsoft/api-guidelines/blob/master/Guidelines.md#113-json-serialization-of-dates-and-times.