On Mon, Jun 11, 2012 at 1:22 PM, Sam Albers <[email protected]> wrote: > Hello, > > I am trying to define a different interval for a "year". In hydrology, > a "water year" is defined as the period between October 1st and > September 30 of the following year. I was wondering how I might do > this in R. Say I have a data.frame like the following and I want to > extract a variable with the water year specs as defined above: > > df<-data.frame(Date=seq(as.Date("2000/10/1"), as.Date("2003/9/30"), "days")) > > ## Extract the normal year > df$year <- factor(format(as.Date(df$Date), "%Y")) > > So the question is how might I define a variable that extends from > October 1st to September 30th rather than the normal January 1st to > December 31st? >
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