Events Calendar PRO > Use today as the start of the week for the This Week widget

functions.php

<?php

/**
 * Use today as the start of the week for the This Week widget.
 *
 * @param $instance
 * @param $widget
 *
 * @return mixed
 * @author Barry Hughes
 * 
 */
function this_week_dynamic_start_init( $instance, $widget ) {
    if ( ! is_a( $widget, 'Tribe__Events__Pro__This_Week_Widget' ) ) {
        return $instance;
    }

    add_filter( 'pre_option_start_of_week', function () {
        static $has_run = 0;

        if ( ! $has_run++ ) {
            return (int) date_i18n( 'w' );
        }
    } );

    return $instance;
}

/**
 * Adjust the week start date for this week ajax requests.
 *
 * Monkeying with superglobals in this way is definitely bad, this
 * works around other issues currently in ECP.
 */
function this_week_dynamic_start_ajax() {
    $nominal_start = date_create( $_POST['start_date'] );
    $day_of_week   = date_i18n( 'N' );
    $start_of_week = $nominal_start->format( 'N' );
    $adjustment    = $start_of_week - $day_of_week;
    $adjustment    = $adjustment > 0 ? '+' . $adjustment : '-' . $adjustment;

    $_POST['start_date'] = $nominal_start->modify( $adjustment . ' days' )->format( 'Y-m-d' );
}

add_filter( 'widget_display_callback', 'this_week_dynamic_start_init', 10, 2 );
add_action( 'wp_ajax_tribe_this_week', 'this_week_dynamic_start_ajax' );
add_action( 'wp_ajax_nopriv_tribe_this_week', 'this_week_dynamic_start_ajax' );