https://chcweb.com/wp-content/plugins/yith-woocommerce-pre-order-p…/js/frontend-single-product.js?ver=3.3.0

1jQuery( function( $ ) {
2    var button = $( '.single_variation_wrap .single_add_to_cart_button' );
3    var add_to_cart_text = button.html();
4    $( 'form.variations_form' )
5        .on( 'show_variation', function( event, variation, purchasable ) {
6            var button = $( this ).find( '.single_add_to_cart_button' ); // It's mandatory to override this variable in order to take specifically the current button (when there is more than 1 Variable product in the current page).
7
8            if ( 'yes' === variation.is_pre_order ) {
9                // Show button label
10                button.html( variation.pre_order_label );
11
12                // Show date label
13                var unix_time = parseInt( $( this ).find( 'div.pre_order_single' ).data( 'time' ) );
14                var date = new Date( 0 );
15                date.setUTCSeconds( unix_time );
16                var time = date.toLocaleTimeString();
17                time = time.slice( 0, -3 );
18                $( this ).find( '.pre_order_single .availability_date' ).text( date.toLocaleDateString() );
19                $( this ).find( '.pre_order_single .availability_time' ).text( time );
20
21            } else {
22                button.html( add_to_cart_text );
23            }
24        } )
25        .on( 'hide_variation', function( event ) {
26            var button = $( this ).find( '.single_add_to_cart_button' );
27            event.preventDefault();
28            button.html( add_to_cart_text );
29        } );
30
31    // Show date label for simple products
32    $( 'div.pre_order_single, div.pre_order_loop' ).each( function () {
33        var unix_time = parseInt( $( this ).data( 'time' ) );
34        var date = new Date( 0 );
35        date.setUTCSeconds( unix_time );
36        var time = date.toLocaleTimeString();
37        time = time.slice( 0, -3 );
38        $( this ).find( '.availability_date' ).text( date.toLocaleDateString() );
39        $( this ).find( '.availability_time' ).text( time );
40    } );
41} );