JS里计算两个时间的年数差

JavaScript08

JS里计算两个时间的年数差,第1张

<html>

<head><script language="javascript">function get_value(){ var set_year ///用于接收用户自定义时间的变量 set_year=1990 var d = new Date() var get_year= d.getYear()//获取系统中的当前年份 var alert_date=get_year-set_year var div_id=document.getElementById("show")//放到body中的层（div）中 div_id.innerHTML= alert_date}

</script>

</head>

<body><div id="show"></div><body></html>//我这没环境，你试试，应该是这样。

// 计算两个时间戳相差的多少年多少月多少天

calculateDiffTime() {

  let startTime = '1629107469000'  //2021-08-16 17:51

  let endTime = '1976262719000'  //2032-08-16 17:51

  let flag = [1, 3, 5, 7, 8, 10, 12, 4, 6, 9, 11, 2]

  let start = new Date(startTime)

  let end = new Date(endTime)

  let year = end.getFullYear() - start.getFullYear()

  let month = end.getMonth() - start.getMonth()

  let day = end.getDate() - start.getDate()

  if (month <0) {

    year--

    month = end.getMonth() + (12 - start.getMonth())

  }

  if (day <0) {

    month--

    let index = flag.findIndex((temp) =>{

      return temp === start.getMonth() + 1

    })

    let monthLength

    if (index <= 6) {

      monthLength = 31

    } else if (index >6 &&index <= 10) {

      monthLength = 30

    } else {

      monthLength = 28

    }

    day = end.getDate() + (monthLength - start.getDate())

  }

  this.result = `相差${year}年${month}月${day}天`

  console.log(this.result)

}

#  计算两个时间戳相差的多少年多少月多少天多少小时多少分多少秒（另一种写法）

//计算两个时间戳相差的多少年多少月多少天多少小时多少分多少秒

calculateDiffTime (){

  let startTime = '1629107469000'  //2021-08-16 17:51

  let endTime = '1976262719000'  //2032-08-16 17:51

  let runTime = parseInt((endTime - startTime) / 1000)

  var year = Math.floor(runTime / 86400 / 365)

  runTime = runTime % (86400 * 365)

  var month = Math.floor(runTime / 86400 / 30)

  runTime = runTime % (86400 * 30)

  var day = Math.floor(runTime / 86400)

  runTime = runTime % 86400

  var hour = Math.floor(runTime / 3600)

  runTime = runTime % 3600

  var minute = Math.floor(runTime / 60)

  runTime = runTime % 60

  var second = runTime

  console.log(`相差${year}年${month}月${day}天${hour}小时${minute}分${second}秒`)

　return year+','+month+','+day+','+hour+','+minute+','+second

}

var firstDate = new Date(2012,4,5)

var secondDate = new Date(2013, 4, 5)

var years=0

while (firstDate.setFullYear(firstDate.getFullYear() + 1) <= secondDate)

{

    years++

}

alert("相差" + years + "年")

已考虑闰年