Extract datepicker as a helper.

src/main/twirl/datepicker.scala.html

@@ -0,0 +1,11 @@
+@(name: String, value: Option[java.util.Date])
+@import view.helpers
+<div id="@name" class="input-append date" data-date-format="yyyy-mm-dd" data-date="@value.map(helpers.date)">
+  <input class="span2" name="@name" type="text" readonly="" value="@value.map(helpers.date)" size="16"/>
+  <span class="add-on"><i class="icon-calendar"></i></span>
+</div>
+<script>
+$(function(){
+  $('#@name').datepicker();
+});
+</script>