public override string ToString()
 {
     if (isRelative)
     {
         return(DFSUtil.DurationToString(ms));
     }
     return(DFSUtil.DateToIso8601String(Sharpen.Extensions.CreateDate(ms)));
 }
 /// <returns>When this directive expires, as an ISO-8601 formatted string.</returns>
 public string GetExpiryTimeString()
 {
     return(DFSUtil.DateToIso8601String(Sharpen.Extensions.CreateDate(expiryTime)));
 }