#' Validates If Date UTC
#'
#' Validates If Date UTC
#'
#' @param data A data frame.
#' @param x Column name from \code{data} (character string).
#' @param \dots ignored.
#' @export
#' @examples
#' dat <- data.frame(
#' start = c("2016-01-01T09", "R2D2-3CPO", sprintf("2016-04-%sT09", 12:19), NA),
#' end = c(NA, sprintf("2016-01-%sT09", 11:20)),
#' stringsAsFactors = FALSE
#' )
#'
#' vc_utc_date(dat, 'start')
#' vc_utc_date(dat, 'end')
vc_utc_date <- function(data, x, ...){
## select the column & replace missing with NA
col <- sub_out_missing(data[[x]])
## record missing (NA)
is_na <- is.na(col)
## expression to validate against (elementwise)
col[!is_na] <- parsedate::parse_iso_8601(trimws(col[!is_na]))
is_valid <- !c(is.na(col) & !is_na)
## valid columnwise: Are all elelemnts either valid or NA?
are_valid <- all(is_valid|is_na)
## generate the comment
if (!are_valid){
message <- sprintf(
"%s contains %s rows that do not follow the UTC date format:\n\n%s\n\n\n\n",
sQuote(x),
length(!(is_valid|is_na)),
output_truncate(which(!(is_valid|is_na)))
)
} else {
message <- NULL
}
## construct vc list & class
vc_output <- list(
column_name = x,
valid = are_valid,
message = message,
passing = is_valid,
missing = is_na,
call = 'vc_utc_data'
)
class(vc_output) <- 'vc'
vc_output
}
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.