installed plugin Easy Digital Downloads version 3.1.0.3

wp-content/plugins/easy-digital-downloads/assets/js/admin/components/date-picker/index.js

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+/**
+ * Date picker
+ *
+ * This juggles a few CSS classes to avoid styling collisions with other
+ * third-party plugins.
+ */
+jQuery( document ).ready( function( $ ) {
+	const edd_datepicker = $( 'input.edd_datepicker' );
+
+	if ( edd_datepicker.length > 0 ) {
+		edd_datepicker
+
+		// Disable autocomplete to avoid it covering the calendar
+			.attr( 'autocomplete', 'off' )
+
+		// Invoke the datepickers
+			.datepicker( {
+				dateFormat: edd_vars.date_picker_format,
+				beforeShow: function() {
+					$( '#ui-datepicker-div' )
+						.removeClass( 'ui-datepicker' )
+						.addClass( 'edd-datepicker' );
+				},
+			} );
+	}
+} );