[Time Conductor] Display invalid state

...when text value can be parsed in a date-time field,
but numeric value violates externally-imposed validation

platform/commonUI/general/res/templates/controls/datetime-field.html

@@ -24,7 +24,10 @@
     <input type="text"
            ng-model="textValue"
            ng-blur="restoreTextValue(); ngBlur()"
-           ng-class="{ error: textInvalid }">
+           ng-class="{
+                     error: textInvalid,
+                     test: structure.validate && !structure.validate(ngModel[field])
+                     }">
     </input>
     <a class="ui-symbol icon icon-calendar"
        ng-if="structure.format === 'utc' || !structure.format"