[R] A Date related problem

[Megh]

Dear all,

Please consider following date "as.Date("2009-02-01")". If I subtract "1"
then it will give last day, similarly if I subtract "2" it will give 2nd
last day. But what about if I want to get "last month", "2md last month"
i.e. "2009-01-01" or "2008-12-01" etc or even year?

Is there any automated way (like day-case, as explained) for doing that?

Your help will be highly appreciated.

Thanks,
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