---
title: "How can I change the day weeks start on in Calendar?"
date: 2026-04-23
author: "GravityKit"
link: "https://www.gravitykit.com/docs/gravitycalendar/calendar-week-start/"
---

![Dropdown menu to select start day of the week, currently set to Monday, with a "Save Changes" button](https://www.gravitykit.com/wp-content/uploads/2025/10/file-8tk5rp9y5L.png)
*For the [GravityCalendar add-on](https://www.gravitykit.com/products/calendar/), by default, the week starts on the same day as the value of the "Week Starts On" setting configured in WordPress*
The settings can be accessed by clicking on Settings in the sidebar in the WordPress dashboard, then clicking on "General".

## Filters for people comfortable with code:

You can add this snippet to your site to modify the start day to Monday:

```

add_filter( 'gravityview/calendar/options', function( $calendar_options, $form_id, $feed_id ) {
 
	// Set the calendar week to start on Monday
	$calendar_options['firstDay'] = 1;

	return $calendar_options;
});
```

```

add_filter( 'gravityview/calendar/options', function( $calendar_options, $form_id, $feed_id ) {
 
	// Set the calendar week to start on Monday
	$calendar_options['firstDay'] = 1;

	return $calendar_options;
});
```

If you want to change the starting day, but only for a specific calendar feed, **update the code below** with the feed ID you're using:

```

add_filter( 'gravityview/calendar/options', function( $calendar_options, $form_id, $feed_id ) {
 
	//
	// REPLACE 4 WITH THE ID OF YOUR CALENDAR FEED!
	//
	if( 4 !== $feed_id ) {
		return $calendar_options;
	}
	
	// Set the calendar week to start on Monday
	$calendar_options['firstDay'] = 1;

	return $calendar_options;
});
```

```

add_filter( 'gravityview/calendar/options', function( $calendar_options, $form_id, $feed_id ) {
 
	//
	// REPLACE 4 WITH THE ID OF YOUR CALENDAR FEED!
	//
	if( 4 !== $feed_id ) {
		return $calendar_options;
	}
	
	// Set the calendar week to start on Monday
	$calendar_options['firstDay'] = 1;

	return $calendar_options;
});
```

Read here how to add these code samples to your website: [Where to put code samples.](https://www.gravitykit.com/docs/gravityview/customizing-your-views/where-to-put-code-samples/)