1、常用日期、时间处理工具类

export default {
  // 获取当前时间 (YY-MM-DD)
  getNowFormatDay() {
    var date = new Date()
    var seperator1 = '-'
    var month = date.getMonth() + 1 < 10 ? '0' + (date.getMonth() + 1) : date.getMonth() + 1
    var strDate = date.getDate() < 10 ? '0' + date.getDate() : date.getDate()
    var currentdate = date.getFullYear() + seperator1 + month + seperator1 + strDate
    return currentdate
  },
  // 获取当前时间 (YY-MM)
  getNowMonth() {
    var date = new Date()
    var seperator1 = '-'
    var month = date.getMonth() + 1 < 10 ? '0' + (date.getMonth() + 1) : date.getMonth() + 1
    var currentdate = date.getFullYear() + seperator1 + month
    return currentdate
  },
  // 获取上月当前时间 (YY-MM-DD)
  getBeforeFormatDay() {
    var date = new Date()
    var seperator1 = '-'
    var month = date.getMonth() < 10 ? '0' + date.getMonth() : date.getMonth()
    var strDate = date.getDate() < 10 ? '0' + date.getDate() : date.getDate()
    var currentdate = date.getFullYear() + seperator1 + month + seperator1 + strDate
    return currentdate
  },
  // 获取上月当前时间 (YY-MM)
  getBeforeMonth() {
    var date = new Date()
    var seperator1 = '-'
    var month = date.getMonth() < 10 ? '0' + date.getMonth() : date.getMonth()
    var currentdate = date.getFullYear() + seperator1 + month
    return currentdate
  },
  // 获取当前时间 (YY-MM-DD hh:mm:ss)
  getNowFormatDate() {
    var date = new Date()
    var seperator1 = '-'
    var seperator2 = ':'
    var month = date.getMonth() + 1 < 10 ? '0' + (date.getMonth() + 1) : date.getMonth() + 1
    var strDate = date.getDate() < 10 ? '0' + date.getDate() : date.getDate()
    var currentdate = date.getFullYear() + seperator1 + month + seperator1 + strDate +
          ' ' + date.getHours() + seperator2 + date.getMinutes() +
          seperator2 + date.getSeconds()
    return currentdate
  },
  // 两个日期对比
  compareTime(oldTime, newTime) {
    return new Date(newTime).getTime() - new Date(oldTime).getTime()
  },
  // 和当前时间对比
  compareNowDate(yourDate) {
    return new Date(yourDate).getTime() - new Date().getTime()
  },
  // 获取当前年度
  getNowYear() {
    var date = new Date()
    var currentdate = date.getFullYear() + ''
    return currentdate
  },
  // 获取上一年度
  getAgoYear() {
    var date = new Date()
    var currentdate = date.getFullYear() - 1 + ''
    return currentdate
  },
  // 获取n个月前当前日期 (YY-MM-DD)
  getBeforeMonthDay(monthNum) {
    var now_date = new Date()
    var seperator1 = '-'
    var now_month = now_date.getMonth() + 1 < 10 ? '0' + (now_date.getMonth() + 1) : now_date.getMonth() + 1
    var now_strDate = now_date.getDate() < 10 ? '0' + now_date.getDate() : now_date.getDate()
    var currentdate = now_date.getFullYear() + seperator1 + now_month + seperator1 + now_strDate // 获取当前日期
    const dateArr = currentdate.split('-')
    const year = dateArr[0] // 获取当前日期的年份
    const month = dateArr[1] // 获取当前日期的月份
    const day = dateArr[2] // 获取当前日期的日
    // let days = new Date(year, month, 0)
    // days = days.getDate() // 获取当前日期中月的天数
    let year2 = year
    let month2 = parseInt(month) - monthNum
    if (month2 <= 0) {
      year2 =
        parseInt(year2) -
        parseInt(month2 / 12 === 0 ? 1 : Math.abs(parseInt(month2 / 12)) + 1)
      month2 = 12 - (Math.abs(month2) % 12)
    }
    let day2 = day
    let days2 = new Date(year2, month2, 0)
    days2 = days2.getDate()
    if (day2 > days2) {
      day2 = days2
    }
    if (month2 < 10) {
      month2 = '0' + month2
    }
    const t2 = year2 + '-' + month2 + '-' + day2
    return t2
  }
}