时间格式转换为过去xx单位前

js
const dayjs = require('dayjs')
 
function timeAgo(date, format = null) {
  const now = dayjs()
  const ago = dayjs(date)
 
  if (now.isBefore(ago)) {
    // If the difference is greater than a year, return formatted date
    return ago.format('YYYY-MM-DD')
  } else {
    let diff = now.diff(ago, 'second')
 
    if (format) {
      return ago.format(format)
    }
 
    const units = [
      [60, '秒'],
      [60, '分钟'],
      [24, '小时'],
      [7, '天'],
      [30.44, '个月'], // Approximation for month length
      [12, '年'], // Approximation for year length
    ]
 
    for (const [interval, label] of units) {
      if (diff < interval) {
        return Math.round(diff) + label + '前'
      }
      diff /= interval // 转换单位
    }
  }
}
 
console.log(timeAgo(Date.now() - 1000 * 60 * 0.5)) // 30秒前
console.log(timeAgo(Date.now() - 1000 * 60 * 1)) // 1分钟前
console.log(timeAgo(Date.now() - 1000 * 60 * 25)) // 25分钟前
console.log(timeAgo(Date.now() - 1000 * 60 * 3000)) // 2天前
console.log(timeAgo(Date.now() - 1000 * 60 * 60000)) // 6个月前