Fix date format for active datepicker filters

flask_admin/templates/bootstrap3/admin/model/layout.html

@@ -46,7 +46,7 @@
                         {%- endfor %}
                     </select>
                     {%- else -%}
-                        <input name="flt{{n}}_{{ filter_arg }}" type="text" value="{{ value or '' }}" class="filter-val  form-control"{% if filter.data_type %} data-role="{{ filter.data_type }}"{% endif %}></input>
+                        <input name="flt{{n}}_{{ filter_arg }}" type="text" value="{{ value or '' }}" class="filter-val  form-control"{% if filter.data_type %} data-role="{{ filter.data_type }}"{% endif %} {% if filter.data_type == "datepicker" %}data-date-format="YYYY-MM-DD"{% endif %}></input>
                     {%- endif -%}
                 </td>
             </tr>