graph = graph.subgraph(new ByLabel<>("person"), new ByLabel<>("knows"));

graph = graph.vertexInducedSubgraph(
    new Or<>(
      new ByLabel<>("university"),
      new And<>(new ByLabel<>("person"), new ByProperty<>("browserUsed", PropertyValue.create("Firefox")))));

graph = graph.edgeInducedSubgraph(
    new CreatedInPeriod<>(LocalDateTime.of(2012, 1, 1, 0, 0), LocalDateTime.of(2012, 1, 5, 0, 0)));

private static class CreatedInPeriod<E extends Edge> implements FilterFunction<E> {
  private LocalDateTime lowerBound, upperBound;
  public CreatedInPeriod(LocalDateTime start, LocalDateTime end) {
    this.lowerBound = start;
    this.upperBound = end;
  }
  @Override
  public boolean filter(E edge) throws Exception {
    if (edge.hasProperty("creationDate")) {
      LocalDateTime creationDate = edge.getPropertyValue("creationDate").getDateTime();
      return (creationDate.isEqual(lowerBound) || creationDate.isAfter(lowerBound)) &&
        creationDate.isBefore(upperBound);
    }
    return false;
  }
}