javascript-年龄计算

有 2 个 JavaScript 日期,

有 2 个 JavaScript 日期,

第一个是出生日期,第二个是从该日期计算年龄的日期。

什么应该是做到这一点的最好方法。

47
function calculateAge (birthDate, otherDate) {
    birthDate = new Date(birthDate);
    otherDate = new Date(otherDate);
    var years = (otherDate.getFullYear() - birthDate.getFullYear());
    if (otherDate.getMonth() < birthDate.getMonth() || 
        otherDate.getMonth() == birthDate.getMonth() && otherDate.getDate() < birthDate.getDate()) {
        years--;
    }
    return years;
}

例子:

var age = calculateAge("02/24/1991", "02/24/2010"); // Format: MM/DD/YYYY
19

这里是一个方法:

function getAge(d1, d2){
    d2 = d2 || new Date();
    var diff = d2.getTime() - d1.getTime();
    return Math.floor(diff / (1000 * 60 * 60 * 24 * 365.25));
}
console.log( getAge(new Date(1978, 10, 3)) );

注意月份。Javascript 从 0 开始计数。
1978, 10, 3表示 1978 年 11 月 3 日

6
function getAge(dateString) {
  var now = new Date();
  var today = new Date(now.getYear(),now.getMonth(),now.getDate());
  var yearNow = now.getYear();
  var monthNow = now.getMonth();
  var dateNow = now.getDate();
  var dob = new Date(dateString.substring(6,10),
                     dateString.substring(0,2)-1,                   
                     dateString.substring(3,5)                  
                     );
  var yearDob = dob.getYear();
  var monthDob = dob.getMonth();
  var dateDob = dob.getDate();
  var age = {};
  var ageString = "";
  var yearString = "";
  var monthString = "";
  var dayString = "";
  yearAge = yearNow - yearDob;
  if (monthNow >= monthDob)
    var monthAge = monthNow - monthDob;
  else {
    yearAge--;
    var monthAge = 12 + monthNow -monthDob;
  }
  if (dateNow >= dateDob)
    var dateAge = dateNow - dateDob;
  else {
    monthAge--;
    var dateAge = 31 + dateNow - dateDob;
    if (monthAge < 0) {
      monthAge = 11;
      yearAge--;
    }
  }
  age = {
      years: yearAge,
      months: monthAge,
      days: dateAge
      };
  if ( age.years > 1 ) yearString = " years";
  else yearString = " year";
  if ( age.months> 1 ) monthString = " months";
  else monthString = " month";
  if ( age.days > 1 ) dayString = " days";
  else dayString = " day";
  if ( (age.years > 0) && (age.months > 0) && (age.days > 0) )
    ageString = age.years + yearString + ", " + age.months + monthString + ", and " + age.days + dayString + " old.";
  else if ( (age.years == 0) && (age.months == 0) && (age.days > 0) )
    ageString = "Only " + age.days + dayString + " old!";
  else if ( (age.years > 0) && (age.months == 0) && (age.days == 0) )
    ageString = age.years + yearString + " old. Happy Birthday!!";
  else if ( (age.years > 0) && (age.months > 0) && (age.days == 0) )
    ageString = age.years + yearString + " and " + age.months + monthString + " old.";
  else if ( (age.years == 0) && (age.months > 0) && (age.days > 0) )
    ageString = age.months + monthString + " and " + age.days + dayString + " old.";
  else if ( (age.years > 0) && (age.months == 0) && (age.days > 0) )
    ageString = age.years + yearString + " and " + age.days + dayString + " old.";
  else if ( (age.years == 0) && (age.months > 0) && (age.days == 0) )
    ageString = age.months + monthString + " old.";
  else ageString = "Oops! Could not calculate age!";
  return ageString;
}
// A bit of jQuery to call the getAge() function and update the page...
$(document).ready(function() {
  $("#submitDate").click(function(e) {
    e.preventDefault();
    $("#age").html(getAge($("input#date").val()));
  });
});
and HTML IS

日期 (MM / DD / YYYY):计算年龄

2

使用getTime()将日期转换为自以来的毫秒数,然后减去值并将结果转换回年:

const MS_PER_YEAR = 1000 * 60 * 60 * 24 * 365.2425;
var years = Math.floor((dateNow.getTime() - dateThen.getTime()) / MS_PER_YEARS);

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