Create a formattable Date vector
# S3 method for class 'Date'
formattable(x, ..., formatter = "format.Date", preproc = NULL, postproc = NULL)a formattable Date vector
dates <- as.Date("2015-04-10") + 1:5
fdates <- formattable(dates, format = "%m/%d/%Y")
fdates
#> [1] 04/11/2015 04/12/2015 04/13/2015 04/14/2015 04/15/2015
fdates + 30
#> [1] 05/11/2015 05/12/2015 05/13/2015 05/14/2015 05/15/2015