We are unsure which control you have used to plot these nodes, but if this control is able to plot DateTime values, it should be possible for you to find out the minimum and maximum of the DateTime range. After that you need to simply set the properties of the timeline (or timebar, depending on your needs it could be a better fit), properties like PeriodStart, PeriodEnd, VisiblePeriodStart and VisiblePeriodEnd. You can try this and follow us up on the progress of your application. If you need further assistance with this, I will ask that you prepare a small project that demonstrates what you have so far. We do not need your actual application, just the part with the timeline (or timebar) and the graph of nodes.
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