# abbrevDayHeadings

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

Whether to display "Sun" versus "Sunday" for days of the week.

<div class='removed-notice'>
This option was removed in version 1.3. Use <a href='https://legacy.fullcalendar.io/v1/columnFormat.md'>columnFormat</a> instead.
</div>

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