Unable to collect data from metric query language MQL - GCP

I want to execute MQL (metric query language) using below library.

<dependency>
	<groupId>com.google.apis</groupId>
	<artifactId>google-api-services-monitoring</artifactId>
	<version>v3-rev540-1.25.0</version>
</dependency>

Here is my code snippet. which will create monitoring client and will try to collect data from GCP monitoring.

public void queryTimeSeriesData() throws IOException {
		// create monitoring 
	    Monitoring m = createAuthorizedMonitoringClient();
	    QueryTimeSeriesRequest req  = new QueryTimeSeriesRequest();
	    String query = "fetch consumed_api\n" + 
	    		"| metric 'serviceruntime.googleapis.com/api/request_count'\n" + 
	    		"| align rate(2m)\n" + 
	    		"| every 2m\n" + 
	    		"| group_by [metric.response_code],\n" + 
	    		"    [value_request_count_max: max(value.request_count)]";
	    
	    req.setQuery(query);
	    HashMap<String, Object> queryTransformationSpec = new HashMap<String, Object>();
	    HashMap<String, Object> timingState =  new HashMap<String, Object>();
	    HashMap<String, Object> absoluteWindow = new HashMap<String, Object>();
	    absoluteWindow.put("startTime", "2020-09-03T12:40:00.000Z");
	    absoluteWindow.put("endTime", "2020-09-03T13:41:00.000Z");
	    timingState.put("absoluteWindow", absoluteWindow);
	    timingState.put("graphPeriod", "60s");
	    timingState.put("queryPeriod", "60s");
	    queryTransformationSpec.put("timingState", timingState);
	    
	    
	    req.set("queryTransformationSpec", queryTransformationSpec);
	    req.set("reportPeriodicStats", false);
	    req.set("reportQueryPlan", false);
	    
	    QueryTimeSeriesResponse res = m.projects().timeSeries().query("projects/MY_PROJECT_NAME", req).execute();
	    System.out.println(res);
	}

Above code is working fine but its not returning data of given startTime and endTime ,
It always returns latest datapoint available. is there any problem with my code ?

Found way to execute MQL query with given time range. The
new working code is the following:

public void queryTimeSeriesData() throws IOException {
        // create monitoring 
        Monitoring m = createAuthorizedMonitoringClient();
        QueryTimeSeriesRequest req  = new QueryTimeSeriesRequest();
	    String query = "fetch consumed_api\n" + 
	    		"| metric 'serviceruntime.googleapis.com/api/request_count'\n" + 
	    		"| align rate(5m)\n" + 
	    		"| every 5m\n" + 
	    		"| group_by [metric.response_code],\n" + 
	    		"    [value_request_count_max: max(value.request_count)]" + 
	    		"| within   d'2020/09/03-12:40:00', d'2020/09/03-12:50:00'\n";
        
        req.setQuery(query);
        QueryTimeSeriesResponse res = m.projects().timeSeries().query("projects/MY_PROJECT_NAME", req).execute();
        System.out.println(res);
    }

Included query start time and end time in query itself by using within operator. As per google docs for MQL queries:

> within - Specifies the time range of the query output.