Thank you for quick reply. Iam using Splunk.Logging.TraceListener.Core package and setup is done like in this example for HTTP Event Collector, TraceListener. But this is using HttpEventCollectorEventInfo with constructor:   public HttpEventCollectorEventInfo(DateTime datetime, string id, string severity, string message, object data, Metadata metadata) { Timestamp = (datetime - new DateTime(1970, 1, 1)).TotalSeconds.ToString("#.000", Thread.CurrentThread.CurrentCulture); this.metadata = (metadata ?? new Metadata()); Event = new LoggerEvent(id, severity, message, data); }    Timestamp format here is dependent on my Culture and if culture has comma as delimiter, requests will always fail. Is there recommended workaround for this? ... View more