i have converted my data into date format like below:

> day=as.Date(originaldate,"%m/%d/%Y")
> day[1:5]
[1] "2008-04-12" "2011-07-02" "2011-09-02" "2008-04-12" "2008-04-12"

I wish to select only those observations from 2007 to 2009, how can I
select from this list?

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