To learn the system I decided to dive into some coding again and create myself a module. The module on itself is quite simple and adds a field to Orchard that can be used to enhance your content types.
The field adds two text boxes where you can provide a start and end moment either by date, time or both.
It is build for Orchard CMS 1.4, that was just release earlier. As this is my first module I expect some issues here or there but we'll see how it goes.
The module is hosted on codeplex: http://orcharddatetimerange.codeplex.com/
And available through the public Orchard Gallery: https://gallery.orchardproject.net/List/Modules/Orchard.Module.Line20.DateTimeRangeField/0.7