[R] Simple Newbie Question

[MassimoH]

How do I plot data like this:

Date,Series,Value
1/5/2007,Blue,300
1/20/2007,Blue,400
1/9/2007,Red,200
1/15/2007,Red,500

Two things I'm having trouble figuring out from online help & tutorials:

1) How does R handle dates? It seems there is no built-in support for dates,
but some standard add-ons provide date functionality? I can also convert my
dates to number of days, however I'd like my plots to show date values on
the x-axis.
2) How do plots support multiple "series" of data? Using R terms, the Series
is a "factor" type. I want each series to be plotted with a different color.

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