How to change the date separator from mm/dd/yyyy to mm.dd.yyyy and add 00:00 in the end?

[Achiranga (Achiranga Gunasekara)]

DateTime.ParseExact(hostDateFrom.toString, “MM/dd/yyyy”, System.Globalization.CultureInfo.InvariantCulture).ToString(“MM.dd.yyyy hh:mm”)

or modify Date activity