\WP_Stager_Integration\Calendar::format_day_label(int $timestamp, array $args = array()): string

Full Code

/**
 * Formats a Unix timestamp into a text label for days in the calendar (e.g. "January 1, 2000").
 *
 * Uses the site's <code>date_format</code> option as date format.
 *
 * @param int   $timestamp   A Unix timestamp
 * @param array $args       (Optional) Additional arguments passed to the component template.
 *
 * @return string   A formatted day label
 */
public static function format_day_label( $timestamp, $args = array() ) {

    // Type casting
    $timestamp = (int) $timestamp;
    $args      = (array) $args;

    // Get data
    $view = (string) ($args[ 'view' ] ?? 'calendar');

    switch ( $view ) {
        case 'calendar':
            $date_format = 'j';
            break;

        case 'list':
            $date_format = 'D j M';
            break;

        default:
            $date_format = (string) (get_option( 'date_format' ) ?: 'F j, Y');
            break;
    }

    // Define default label
    $default = wp_date( $date_format, $timestamp );

    /**
     * Filters the default calendar "day" label text.
     *
     * @param string    $label      The label text
     * @param int       $timestamp  A Unix timestamp of the start of the day (00:00:00 in the site's timezone)
     * @param array     $args       Additional arguments passed to the component template.
     *
     * @return string   Must return a string
     */
    $label = (string) apply_filters( 'wpstagerintegration_calendar_label_day', $default, $timestamp, $args );

    return $label;
}