gsub() in R is not replacing '.' (dot)

You may need to escape the . which is a special character that means "any character" (from @Mr Flick's comment)

 gsub('\\.', '-', x) #[1] "2014-06-09"

gsub('[.]', '-', x)#[1] "2014-06-09"

Or as @Moix mentioned in the comments, we can also use fixed=TRUE instead of escaping the characters.

 gsub(".", "-", x, fixed = TRUE)

r regex gsub stringr

For more complex tasks the stringr package could be interesting

library(stringr)str_replace_all(x,"\\.","-")## [1] "2014-06-09"

str_replace_all(x,"[.]","-")## [1] "2014-06-09"

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