When generating an API with default time values, the defaults are strings, which causes invalid code to be generated.

The following segment:

"time": {
    "type": "string",
    "description": "The end time in ISO8601 (HH:mm:ss) format.",
    "format": "time",
    "default": "24:00:00",
    "example": "13:00:00"
}

generates the following:

public Time? Time { get; set; }

public ScheduledTimeSpan_end()
{
    Time = "24:00:00";
}

... which is a compile error.

repro.zip

.... also, date values don't have any defaults written at all...