code: public boolean isDateFilter(final IFilter _filter) throws EFapsException
      {
          final boolean ret;
          final Field field = Field.get(_filter.getFieldId());
          // Explicitly set UIProvider
          if (field.getUIProvider() != null && (field.getUIProvider() instanceof DateTimeUI || field
                          .getUIProvider() instanceof DateUI)) {
              ret = true;
          } else {
              final Attribute attr = getType().getAttribute(field.getAttribute());
              if (attr == null) {
                  ret = false;
              } else {
                  final IUIProvider uiProvider = attr.getAttributeType().getUIProvider();
                  ret = uiProvider instanceof DateTimeUI || uiProvider instanceof DateUI;
              }
          }
          return ret;
      }
docs: Checks if is date filter.
  
  @param _filter the filter
  @return true, if is date filter
  @throws EFapsException the e faps exception