# weekNumbersWithinDays

> FullCalendar v4 documentation, for an old release. Web version: https://legacy.fullcalendar.io/v4/weekNumbersWithinDays
>
> Upgrading to v7: https://fullcalendar.io/docs/upgrading-from-v6.md

Determines the styling for week numbers in Month and DayGrid views.

<div class='spec' markdown='1'>
boolean. *default*: `false`
</div>

When `weekNumbersWithinDays:false` (the default)

<img src='https://legacy.fullcalendar.io/v4/weekNumbers.png' width='308' height='206' style='box-shadow: 0 1px 4px rgba(0,0,0,.3)' alt='standard week numbers' />

When `weekNumbersWithinDays:true`

<img src='https://legacy.fullcalendar.io/v4/weekNumbersWithinDays.png' width='306' height='216' style='box-shadow: 0 1px 4px rgba(0,0,0,.3)' alt='week numbers within days' />

[View a simple demo](https://legacy.fullcalendar.io/v4/weekNumbersWithinDays-demo) of `weekNumbersWithinDays` set to `true`.