Hierarchical Tree layout with transmission date

It is possible to draw networks in hierarchical tree layout positioned by
transmission date?

Something similar to this:
<http://main-discussion-list-for-the-graph-tool-project.982480.n3.nabble.com/file/t496236/example.png&gt;

It's possible to provide your own tree layout for the drawing, but there
is currently no implementation for the layout that you are specifying.

ok thanks for clarifying!

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