public String process(final Expression expression) {
    return formatExpression(expression);
  }
@Test
  public void shouldGenerateCorrectCodeForDate() {
    // Given:
    final DateLiteral time = new DateLiteral(new Date(864000000));

    // When:
    final String java = sqlToJavaVisitor.process(time);

    // Then:
    assertThat(java, is("1970-01-11"));
  }