I have the following xml which I take from specified url:

```
<gesmes:Envelope xmlns:gesmes="http://www.gesmes.org/xml/2002-08-01" xmlns="http://www.ecb.int/vocabulary/2002-08-01/eurofxref">
    <gesmes:subject>...</gesmes:subject>
    <gesmes:Sender>...</gesmes:Sender>
    <Cube>
        <Cube time="2016-08-16">
           <Cube value="1" />
           <Cube value="2"/>
           <Cube value="3"/>
        </Cube>
    </Cube>
</gesmes:Envelope>

```

From this file I only need to take time value '2016-08-16' using Visual Basic code.