CZML does not appear to support /P style ISO-8601 interval duration specification

[hcarter333]

When an interval is specified in a CZML file as

"interval": "2024-03-14T23:25:00Z/P0Y0M0DT0H1M",

The sandcastle app console returns the following errors stack:

DeveloperError: Invalid ISO 8601 date.
Error
    at new DeveloperError (https://sandcastle.cesium.com/CesiumUnminified/Cesium.js:10552:13)
    at JulianDate.fromIso8601 (https://sandcastle.cesium.com/CesiumUnminified/Cesium.js:19794:21)
    at TimeInterval.fromIso8601 (https://sandcastle.cesium.com/CesiumUnminified/Cesium.js:41690:38)
    at intervalFromString (https://sandcastle.cesium.com/CesiumUnminified/Cesium.js:140320:33)
    at processProperty (https://sandcastle.cesium.com/CesiumUnminified/Cesium.js:140338:28)
    at processPacketData (https://sandcastle.cesium.com/CesiumUnminified/Cesium.js:140477:9)
    at Array.processPolyline (https://sandcastle.cesium.com/CesiumUnminified/Cesium.js:143368:5)
    at processCzmlPacket (https://sandcastle.cesium.com/CesiumUnminified/Cesium.js:143936:28)
    at CzmlDataSource._processCzml (https://sandcastle.cesium.com/CesiumUnminified/Cesium.js:144258:9)
    at loadCzml (https://sandcastle.cesium.com/CesiumUnminified/Cesium.js:144049:20)

Per the Wikipedia page, interval durations can be specified using the /P format.

There's an example of this issue here.

[hcarter333]

The issue appears to be in the following code

Notice that there is not context in the call that assigns stop2. It has no way to handle 'P' specifiers.

[shunter]

Do you have an example of czml-writer code that generates CZML output with the duration syntax?