关于一些时间转换的方法

export function getTimeTimestamp(dateStr) { // 将年月日转换为时间戳并且除以1000
  if (!dateStr) {
    return ''
  }
  const newDataStr = dateStr.replace(/\.|\-/g, '/')
  const date = new Date(newDataStr)
  const timestamp = date.getTime()
  const timestamps = timestamp / 1000
  return timestamps
}

export function getTime(time, bool) { // 传进时间戳将时间戳转换为时间， bool则是控制是否返回时分秒
  const date = new Date(time * 1000)
  const Y = date.getFullYear() + '-'
  const M = (date.getMonth() + 1 < 10 ? '0' + (date.getMonth() + 1) : date.getMonth() + 1) + '-'
  const D = date.getDate() + ' '
  const h = date.getHours() + ':'
  const m = date.getMinutes() + ':'
  const s = date.getSeconds()
  if (bool) {
    return Y + M + D + h + m + s
  } else {
    return Y + M + D
  }
}

export function formatDate(date) { // 将当地时间转换为 1997-01-01的格式
  const y = date.getFullYear()
  let m = date.getMonth() + 1
  m = m < 10 ? '0' + m : m
  let d = date.getDate()
  d = d < 10 ? ('0' + d) : d
  return y + '-' + m + '-' + d
}

export function addAndSubtractTime(date, num, bool, type) { // data格式为1997-01-01,num格式为number类型用于加减几天,bool为布尔类型用于是否需要返回时分秒,type为布尔类型用于加减判断,此方法用于加减时间
  let d = new Date(date)
  if (type) {
    d = d.setDate(d.getDate() + num)
  } else {
    d = d.setDate(d.getDate() - num)
  }
  d = new Date(d)
  let datetime = ''
  if (bool) {
    datetime = d.getFullYear() + '-' + (d.getMonth() + 1) + '-' + d.getDate()
  } else {
    datetime = d.getFullYear() + '-' + (d.getMonth() + 1) + '-' + d.getDate() + ' ' + d.getHours() + ':' + d.getMinutes() + ':' + d.getSeconds()
  }
  return datetime
}

export function Timestamp(val, type) { // 这边我先写死了time 可用 val 来传入的时间戳 此方法是两个时间戳相减得出倒计时的方法
  const time = '1622109600'
  const t = Math.round(new Date().getTime() / 1000)
  const all = parseInt(time) - t
  let d = parseInt(all / 60 / 60 / 24)// 倒计时多少天
  d = d < 10 ? '0' + d : d
  let h = parseInt(all / 60 / 60 % 24) // 倒计时多少小时
  h = h < 10 ? '0' + h : h
  let m = parseInt(all / 60 % 60) // 倒计时多少分钟
  m = m < 10 ? '0' + m : m
  let s = parseInt(all % 60) // 倒计时多少秒
  s = s < 10 ? '0' + s : s
  // console.log(d + '天' + h + '时' + m + '分' + s + '秒')
  return h + ':' + m + ':' + s
}

用中国时区时间计算别的时区
// data 格式为'2020-02-12 12:21:34’

dateFormat(date) {
  //日期格式化
  const d = new Date(new Date(date).getTime() - 8*60*60000 - new Date().getTimezoneOffset() * 60000);
  let year = d.getFullYear()
  let month = d.getMonth() + 1
  month = '0' + month
  month = month.substring(month.length - 2)
  let day = '0' + d.getDate()
  day = day.substring(day.length - 2)
  let hour = '0' + d.getHours()
  hour = hour.substring(hour.length - 2)
  let m = '0' + d.getMinutes()
  m = m.substring(m.length - 2)
  let s = '0' + d.getSeconds()
  s = s.substring(s.length - 2)
  return year + '-' + month + '-' + day + ' ' + hour + ':' + m + ':' + s
},