# Editor example Options - week numbers

It can often be useful to see at a glance what week of the year a week falls into - this option is provided in the `datetime` calendar picker through the `showWeekNumber` option which is specified as part of an `opts` (i.e. options) object.

This example shows the week number enabled for the date picker using a simple ISO8601 date format.

First name | Last name | Updated date | Registered date
--- | --- | --- | ---

- Javascript
- HTML
- CSS
- Ajax
- Server-side script

The Javascript shown below is used to initialise the table shown in this example:

`var editor; // use a global for the submit and return data rendering in the examples $(document).ready(function() { editor = new $.fn.dataTable.Editor( { ajax: '../php/dates.php', table: '#example', fields: [ { label: 'First name:', name: 'first_name' }, { label: 'Last name:', name: 'last_name' }, { label: 'Registered date:', name: 'registered_date', type: 'datetime', opts: { showWeekNumber: true } } ] } ); $('#example').DataTable( { dom: 'Bfrtip', ajax: '../php/dates.php', columns: [ { data: 'first_name' }, { data: 'last_name' }, { data: 'updated_date' }, { data: 'registered_date' } ], select: true, buttons: [ { extend: 'create', editor: editor }, { extend: 'edit', editor: editor }, { extend: 'remove', editor: editor } ] } ); } );`

In addition to the above code, the following Javascript library files are loaded for use in this example:

- //code.jquery.com/jquery-1.12.4.js
- https://cdn.datatables.net/1.10.16/js/jquery.dataTables.min.js
- https://cdn.datatables.net/buttons/1.5.0/js/dataTables.buttons.min.js
- https://cdn.datatables.net/select/1.2.4/js/dataTables.select.min.js
- ../../js/dataTables.editor.min.js

The HTML shown below is the raw HTML table element, before it has been enhanced by DataTables:

This example uses a little bit of additional CSS beyond what is loaded from the library files (below), in order to correctly display the table. The additional CSS used is shown below:

``

The following CSS library files are loaded for use in this example to provide the styling of the table:

- https://cdn.datatables.net/1.10.16/css/jquery.dataTables.min.css
- https://cdn.datatables.net/buttons/1.5.0/css/buttons.dataTables.min.css
- https://cdn.datatables.net/select/1.2.4/css/select.dataTables.min.css
- ../../css/editor.dataTables.min.css

This table loads data by Ajax. The latest data that has been loaded is shown below. This data will update automatically as any additional data is loaded.

The script used to perform the server-side processing for this table is shown below. Please note that this is just an example script using PHP. Server-side processing scripts can be written in any language, using the protocol described in the DataTables documentation.