data-sort-value
| data-sort-value="Doe, John" | John Doe
This template allows you to specify its parameter as the sort key for a cell in sortable tables.
{| class="wikitable sortable" |- !C1 |- |{{Hidden sort key|1999-12-15}}15 December 1999 |- |{{Hidden sort key|1997-04-21}}21 April 1997 |- |{{Hidden sort key|1998-04-21}}21 April 1998 |}
produces: