# weekNumbers

> FullCalendar v1 documentation, for an old release. Web version: https://legacy.fullcalendar.io/v1/weekNumbers
>
> Latest version (v7): https://fullcalendar.io/docs/weekNumbers.md

Determines if week numbers should be displayed on the calendar.

<div class='spec' markdown='1'>
Boolean, *default*: `false`
</div>

If set to `true`, week numbers will be displayed in a separate left column in the month/basic views as well as at the top-left corner of the agenda views.

By defaut, FullCalendar will display the [ISO8601 week number](https://en.wikipedia.org/wiki/ISO_8601#Week_dates). To display other types of week numbers, see [weekNumberCalculation](https://legacy.fullcalendar.io/v1/weekNumberCalculation.md).