CRM2011 CustomActivity Time-Input

Hello guys,

I am currently developing a CustomActivity and I need the User to specify a Time as InArgument. (Just a time and no date)

When I did a bit of research I found out the there are just a few types supported as InArgument-Types. The one that fits best is DateTime, but I was wondering if there is a Meta-Attribute or something to show the user just the Time-Input (just like we can do it in the form of an entity with datetime-fields).

Anyone knows if there is such a Meta-Attribute? Or if there is another option to archieve this?

Greetings

Simon Schulte