# weekStart

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

<div class='removed-notice'>
In version 1.3, this option was renamed to <a href='https://legacy.fullcalendar.io/v1/firstDay.md'>firstDay</a>.
</div>