1.以小时为单位获取差值
1.将小时除以（并四舍五入）24得到天数
1.取余数，这是剩余的小时数

const date1 = dayjs('2021-03-13');
const date2 = dayjs();

let hours = date2.diff(date1, 'hours');
const days = Math.floor(hours / 24);
hours = hours - (days * 24);

console.log('Days: ', days);
console.log('Hours: ', hours);

<script src="https://unpkg.com/dayjs@1.8.21/dayjs.min.js"></script>

同样的逻辑可以使用秒来完成，然后应用一个函数将这些秒转换为天/小时/分钟：Convert seconds to HH-MM-SS with JavaScript?

您可以获得带小数的天数（将true作为第二个参数添加到diff并使用它：

const date1 = dayjs('2021-03-13');
const date2 = dayjs();
const diff = date2.diff(date1,'day',true);
console.log("obtained", diff);
const days = Math.floor(diff);
const hours = Math.floor((diff - days) * 24);
console.log(`${days} days, ${hours} hours`);

<script src="https://unpkg.com/dayjs@1.8.21/dayjs.min.js"></script>

${dayjs(item).diff(now, '小时') day}而不是${dayjs(item).diff(now, '天') day}
第二个参数是要使用的测量单位，您可以将其设置为天