How can I prevent a validation attribute from being generated?

I have a DateTime property in my model, but I'm only interested in the time part:

public class MyModel
{
    [Required, DataType.Time]
    public DateTime Time
}

In my view, I output it like so:

@Html.EditorFor(model => model.Time)

This used to generate the following html in MVC 3:

<input class="text-box single-line" data-val="true" 
    data-val-required="The Time field is required." 
    id="Time" name="Time" type="time" value="" />

Now I'm trying this with MVC 4, and this is the html generated:

<input class="text-box single-line" data-val="true" 
    data-val-date="The field Time must be a date." 
    data-val-required="The Time field is required." 
    id="Time" name="Time" type="time" value="" />

There is an extra attribute data-val-date added, which results in a client side validation error, because a time (e.g. "10:30") isn't formated as a date.

I suppose this is a bug in MVC 4 (I reported it)? But until it's resolved, is there any way to prevent this attribute from being generated? Or even better, is there a way to let it be generated as a data-val-time in stead, so I can provide my own client side validation method for time fields?