RemoteFileExpirationTime Property

Output only. The timestamp of when the File will be deleted. Only set if the File is scheduled to expire. Uses RFC 3339, where generated output will always be Z-normalized and uses 0, 3, 6 or 9 fractional digits. Offsets other than "Z" are also accepted. Examples: "2014-10-02T15:01:23Z", "2014-10-02T15:01:23.045123456Z" or "2014-10-02T15:01:23+05:30".

public Timestamp? ExpirationTime { get; set; }