export const calcDate = (date1, date2) => {
  var date3 = date2 - date1

  var days = Math.floor(date3 / (24 * 3600 * 1000))

  var leave1 = date3 % (24 * 3600 * 1000) // 计算天数后剩余的毫秒数
  var hours = Math.floor(leave1 / (3600 * 1000))

  var leave2 = leave1 % (3600 * 1000) // 计算小时数后剩余的毫秒数
  var minutes = Math.floor(leave2 / (60 * 1000))

  var leave3 = leave2 % (60 * 1000) // 计算分钟数后剩余的毫秒数
  var seconds = Math.round(date3 / 1000)
  return {
    leave1,
    leave2,
    leave3,
    days: days,
    hours: hours,
    minutes: minutes,
    seconds: seconds
  }
}

/**
 * 日期格式化
 */
export function dateFormat(date, format = 'yyyy-MM-dd hh:mm:ss') {
  if (date !== 'Invalid Date') {
    var o = {
      'M+': date.getMonth() + 1, // month
      'd+': date.getDate(), // day
      'h+': date.getHours(), // hour
      'm+': date.getMinutes(), // minute
      's+': date.getSeconds(), // second
      'q+': Math.floor((date.getMonth() + 3) / 3), // quarter
      S: date.getMilliseconds() // millisecond
    }
    if (/(y+)/.test(format)) {
      format = format.replace(
        RegExp.$1,
        (date.getFullYear() + '').substr(4 - RegExp.$1.length)
      )
    }
    for (var k in o) {
      if (new RegExp('(' + k + ')').test(format)) {
        format = format.replace(
          RegExp.$1,
          RegExp.$1.length === 1
            ? o[k]
            : ('00' + o[k]).substr(('' + o[k]).length)
        )
      }
    }
    return format
  }
  return ''
}

/**
 * 日期格式化，转年月日yyyy-MM-dd
 */
export function dateFormatYearMonthDate(date) {
  const dateList = /\d{4}-\d{1,2}-\d{1,2}/g.exec(date)
  if (dateList && dateList.length > 0) {
    return dateList[0]
  } else {
    return date
  }
}

/**
 * 获取年月
 */
export function getYearAndMonth() {
  const date = new Date()
  let year = date.getFullYear()
  let month = date.getMonth() + 1
  if (month < 10) {
    month = '0' + month
  } else {
    month = month + ''
  }
  year = (year + '').substring(2, 4)
  return year + month
}