hugegraph-test/src/main/java/org/apache/hugegraph/core/EdgeCoreTest.java [3707:3732]:
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        edges = graph.traversal().V(v1).outE("call").has("callType", "work")
                     .has("calltime", "2017-5-1 23:00:00")
                     .toList();
        Assert.assertEquals(1, edges.size());
        Assert.assertEquals(Utils.date("2017-5-1 23:00:00"),
                            edges.get(0).value("calltime"));

        edges = graph.traversal().V(v1).outE("call").has("callType", "work")
                     .has("calltime", P.lt("2017-5-2"))
                     .toList();
        Assert.assertEquals(1, edges.size());
        Assert.assertEquals(Utils.date("2017-5-1 23:00:00"),
                            edges.get(0).value("calltime"));

        edges = graph.traversal().V(v1).outE("call").has("callType", "work")
                     .has("calltime", P.gte("2017-5-2"))
                     .toList();
        Assert.assertEquals(4, edges.size());
        Assert.assertEquals(Utils.date("2017-5-2 12:00:01"),
                            edges.get(0).value("calltime"));
        Assert.assertEquals(Utils.date("2017-5-2 15:30:05"),
                            edges.get(1).value("calltime"));
        Assert.assertEquals(Utils.date("2017-5-3 12:08:02"),
                            edges.get(2).value("calltime"));
        Assert.assertEquals(Utils.date("2017-5-3 14:56:06"),
                            edges.get(3).value("calltime"));
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hugegraph-test/src/main/java/org/apache/hugegraph/core/EdgeCoreTest.java [3815:3840]:
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        edges = graph.traversal().V(v1).outE("call").has("callType", "work")
                     .has("calltime", "2017-5-1 23:00:00")
                     .toList();
        Assert.assertEquals(1, edges.size());
        Assert.assertEquals(Utils.date("2017-5-1 23:00:00"),
                            edges.get(0).value("calltime"));

        edges = graph.traversal().V(v1).outE("call").has("callType", "work")
                     .has("calltime", P.lt("2017-5-2"))
                     .toList();
        Assert.assertEquals(1, edges.size());
        Assert.assertEquals(Utils.date("2017-5-1 23:00:00"),
                            edges.get(0).value("calltime"));

        edges = graph.traversal().V(v1).outE("call").has("callType", "work")
                     .has("calltime", P.gte("2017-5-2"))
                     .toList();
        Assert.assertEquals(4, edges.size());
        Assert.assertEquals(Utils.date("2017-5-2 12:00:01"),
                            edges.get(0).value("calltime"));
        Assert.assertEquals(Utils.date("2017-5-2 15:30:05"),
                            edges.get(1).value("calltime"));
        Assert.assertEquals(Utils.date("2017-5-3 12:08:02"),
                            edges.get(2).value("calltime"));
        Assert.assertEquals(Utils.date("2017-5-3 14:56:06"),
                            edges.get(3).value("calltime"));
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