Date plus 1 day

Direct addition 24 * 60 * 3600 Can only be used in new Date() when

let next = new Date((new Date() + 24*60*3600));

Custom date plus one day

let custom = new Date('2022-6-1');
let next = new Date(custom .setDate(custom .getDate() + 1))
// Thu Jun 02 2022 00:00:00 GMT+0800 ( China standard time ) {}
// next.tolocalString()
// 2022/6/2 00:00:00