[JsonPropertyAttribute("OS-SRV-USG:launched_at")]
public Nullable<DateTimeOffset> Launched { get; set; }

<JsonPropertyAttribute("OS-SRV-USG:launched_at")>
Public Property Launched As Nullable(Of DateTimeOffset)
	Get
	Set

public:
[JsonPropertyAttribute(L"OS-SRV-USG:launched_at")]
property Nullable<DateTimeOffset> Launched {
	Nullable<DateTimeOffset> get ();
	void set (Nullable<DateTimeOffset> value);
}

[<JsonPropertyAttribute("OS-SRV-USG:launched_at")>]
member Launched : Nullable<DateTimeOffset> with get, set