Query server time info (#3498)

* sync ui

* query-server-time-info

* query-server-time-info

* query-server-time-info

* query-server-time-info

* query-server-time-info

* sync skywalking-query-protocol

* sync ui

* sync ui

* sync skywalking-query-protocol

* sync skywalking-query-protocol

oap-server/server-query-plugin/query-graphql-plugin/src/main/java/org/apache/skywalking/oap/query/graphql/resolver/MetadataQuery.java

@@ -21,8 +21,11 @@ package org.apache.skywalking.oap.query.graphql.resolver;
 import com.coxautodev.graphql.tools.GraphQLQueryResolver;
 import java.io.IOException;
 import java.text.ParseException;
+import java.text.SimpleDateFormat;
+import java.util.Date;
 import java.util.List;
 import org.apache.skywalking.oap.query.graphql.type.Duration;
+import org.apache.skywalking.oap.query.graphql.type.TimeInfo;
 import org.apache.skywalking.oap.server.core.CoreModule;
 import org.apache.skywalking.oap.server.core.query.*;
 import org.apache.skywalking.oap.server.core.query.entity.*;
@@ -93,4 +96,13 @@ public class MetadataQuery implements GraphQLQueryResolver {
     public List<Database> getAllDatabases(final Duration duration) throws IOException {
         return getMetadataQueryService().getAllDatabases();
     }
+
+    public TimeInfo getTimeInfo() {
+        TimeInfo timeInfo = new TimeInfo();
+        SimpleDateFormat timezoneFormat = new SimpleDateFormat("ZZZZZZ");
+        Date date = new Date();
+        timeInfo.setCurrentTimestamp(date.getTime());
+        timeInfo.setTimezone(timezoneFormat.format(date));
+        return timeInfo;
+    }
 }

oap-server/server-query-plugin/query-graphql-plugin/src/main/java/org/apache/skywalking/oap/query/graphql/type/TimeInfo.java

+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package org.apache.skywalking.oap.query.graphql.type;
+
+import lombok.Getter;
+import lombok.Setter;
+
+@Getter
+@Setter
+public class TimeInfo {
+    /**
+     * server current timezone, format: +0800
+     */
+    private String timezone;
+    /**
+     * server current timestamp, format: 1569124528392
+     */
+    private Long currentTimestamp;
+}

query-protocol @ f9bb3fe4

-Subproject commit 6fc96650acc7f539fcdf6d51648525ce93e5fa1a
+Subproject commit f9bb3fe4d85b7c989d0692f38c3341c3c13646e7

skywalking-ui @ 5583a332

-Subproject commit 206a514ae71267e5b29ac58dba2dbfeaf71a7b2d
+Subproject commit 5583a332551aa957a63e865ee2c42d892ed52de6