For output, the date and time formats use the delimiters indicated in
the table. For input, date components may be separated by spaces or by
one of the characters @samp{-}, @samp{/}, @samp{.}, or @samp{,}, and
-time components may be separated by spaces, @samp{:}, or @samp{.}. On
+time components may be separated by spaces or @samp{:}. On
input, the @samp{Q} separating quarter from year and the @samp{WK}
separating week from year may be uppercase or lowercase, and the spaces
around them are optional.