Not using EditTime, but you can quickly cook the widget you need using the generic EditField, creating appropriate Convert and combining them together. 15 lines effort...
There are three methods in Convert class:
virtual Value Format(const Value& q) const;
-> Use Format to convert your Time into String.
virtual Value Scan(const Value& text) const;
-> Use Scan to convert String into your Time
virtual int Filter(int chr) const;
-> Use Filter to limit/convert characters that can be entered to EditField. Each character is Filter-ed - if returned value is zero, it is discarded, otherwise returned value is inserted to the EditField. Means you can perform some conversions too...