Используется parse_date_time(mixed_format_date, c("dmy_HM", "dmy_HMS")).
Используется HM
и HMS
, поскольку hm
и ms
в настоящее время устарели.
There is a CodeProject article about adding intellisense to your own applications: DIY Intellisense
It should give you a good start.
There are also open source packages that you can dig into if you really want dig deep into an implementation: #develop (short for SharpDevelop) is a free IDE for C#, VB.NET and Boo projects