verted to character strings in the form “YYYY-MM-DD”, but partial dates (“YYYY” and “YYYY-MM”) are permitted. (Note: Partial dates are not supported in R, but one can create character representations of partial dates in the package by specifying <code>date_format</code>.)</p></li>
<li><p>Times are converted to character strings using the ISO 8601 format “hh:mm:ss.fffff”. “fffff” is fractions of a second and must not containing trailing zeroes (as with any numeric value, see [1], above). 