Timeline charts are a great way of visualising different dates/events over time and are now also supported by googleVis from version 0.5.0 onwards (currently only available from GitHub). Here is an example, showing classroom allocation in the afternoon. The exact times and durations are given when you hover over the bars.
I can swap around the bar and row labels to show the rooms by languages:
Here is another example, inspired by Jason Bryer's timeline package, showing the US presidents and UK prime ministers during World War II. For
gvisTimelineI have to remove the line breaks in Jason's data.
And finally a more complex example from the Google Chart Tools API documentation showing the terms of the first US presidents with various options set to change the colours and fonts:
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