To have names of months in English and not in current langage version of R

 > Sys.setlocale(category = "LC_TIME", locale="en_GB.UTF-8")

[1] "en_GB.UTF-8"

 > x <- seq(from=as.Date("2000-04-01"), length.out=100, by=1)

 > y <- rnorm(length(x), 5,2)

 > plot(x, y)

 > Sys.setlocale(category = "LC_TIME", locale="")

[1] "fr_FR.UTF-8"

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