Nothing
# as.Date.numeric <- function (x, origin = "1970-01-01", ...)
# as.Date(origin, ...) + x
as.Date.ts <- function(x, offset = 0, ...) {
time.x <- unclass(time(x)) + offset
if (frequency(x) == 1)
as.Date(paste(time.x, 1, 1, sep = "-"))
else if (frequency(x) == 4)
as.Date(paste((time.x + .001) %/% 1, 3*(cycle(x)-1)+1, 1, sep = "-"))
else if (frequency(x) == 12)
as.Date(paste((time.x + .001) %/% 1, cycle(x), 1, sep = "-"))
else
stop("unable to convert ts time to Date class")
}
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