The code: 
	Select a date, like today's (07/16/2018) and click the form button.
You'll get this:
	Happened with  v12.0p_2018-06-06
							
						
					Code:
	
	DateItem dateItem = new DateItem();
dateItem.setFormat("dd/MM/yyyy");
dateItem.setInputFormat("dd/MM/yyyy");
dateItem.setUseTextField(true);
ButtonItem buttonItem = new ButtonItem();
buttonItem.addClickHandler(new ClickHandler()
{
    @Override
    public void onClick(ClickEvent event)
    {
        Date date = dateItem.getValueAsDate();
        SC.logWarn(date.toString());
    }
});
DynamicForm form = new DynamicForm();
form.setItems(dateItem, buttonItem);
form.draw();
You'll get this:
Code:
	
	05:20:09.831:MUP1:WARN:Log:com.google.gwt.core.client.JavaScriptException: (TypeError) : ret_0_g$.getTime is not a function
    at p2i_g$(gwtreference-0.js@48:153101)
    at KCd_g$(gwtreference-0.js@39:17623)
    at foj_g$(gwtreference-0.js@16:159696)
    at eoj_g$(gwtreference-0.js@8:159688)
    at k9b_g$(gwtreference-0.js@8:7917)
    at mjc_g$(gwtreference-0.js@14:8223)
    at xjc_g$(gwtreference-0.js@9:8321)
    at Djc_g$(gwtreference-0.js@8:8394)
    at ejc_g$(gwtreference-0.js@24:8172)
    at nJd_g$(gwtreference-0.js@23:20177)
    at anonymous(gwtreference-0.js@16:151159)
    at qL_g$(gwtreference-0.js@28:4414)
    at tL_g$(gwtreference-0.js@16:4470)
    at anonymous(gwtreference-0.js@14:4450)
    at RXi_g$.obj_0_g$.click(gwtreference-0.js@12:151166)
    at isc_FormItem__fireStandardHandler(http://127.0.0.1:8888/gwtreference/sc/modules/ISC_Forms.js@143:1296)
    at isc_FormItem_handleClick(http://127.0.0.1:8888/gwtreference/sc/modules/ISC_Forms.js@41:1298)
    at _2.handleActivate(http://127.0.0.1:8888/gwtreference/sc/modules/ISC_Forms.js@114:1740)
    at isc_StatefulCanvas_handleClick(http://127.0.0.1:8888/gwtreference/sc/modules/ISC_Foundation.js@13:229)
    at isc_c_Class_invokeSuper(http://127.0.0.1:8888/gwtreference/sc/modules/ISC_Core.js@93:305)
    at isc_c_Class_Super(http://127.0.0.1:8888/gwtreference/sc/modules/ISC_Core.js@170:297)
    at _2.handleClick(http://127.0.0.1:8888/gwtreference/sc/modules/ISC_Forms.js@142:1738)
    at isc_c_EventHandler_bubbleEvent(http://127.0.0.1:8888/gwtreference/sc/modules/ISC_Core.js@89:2115)
    at isc_c_EventHandler_handleClick(http://127.0.0.1:8888/gwtreference/sc/modules/ISC_Core.js@50:1961)
    at isc_c_EventHandler__handleMouseUp(http://127.0.0.1:8888/gwtreference/sc/modules/ISC_Core.js@11:1946)
    at isc_c_EventHandler_handleMouseUp(http://127.0.0.1:8888/gwtreference/sc/modules/ISC_Core.js@57:1937)
    at isc_c_EventHandler_dispatch(http://127.0.0.1:8888/gwtreference/sc/modules/ISC_Core.js@108:2202)
    at eval(eval at isc__makeFunction (http://127.0.0.1:8888/gwtreference/sc/modules/ISC_Core.js@122:76)
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