Reports which elements of a vector as_messydate() cannot represent, and
why. Where as_messydate() stops at the first problem, or returns NA
for text it could not read, md_problems() inspects every element and
returns one row per failure. This is intended for checking a column of
dates before coercing it.
Value
A data frame with one row per problematic element and the columns
index (its position in x), input (the offending value), and
reason. A zero-row data frame means every element can be coerced.
Examples
md_problems(c("2019-01-01", "2019-02-30", "2019-W12", "not a date"))
#> index input reason
#> 1 2 2019-02-30 '2019-02-30' has day '30', but that month has only 28 days
#> 2 3 2019-W12 week dates (e.g. '2019-W12') are not supported
#> 3 4 not a date could not be parsed as a date
# a clean vector returns no rows
md_problems(c("2019-01-01", "2019-01"))
#> [1] index input reason
#> <0 rows> (or 0-length row.names)