Javascript Date（）按日、月、年计算年龄工作

Question

这是我的代码，从这里采取：计算年龄在JavaScript
它如何继续与月和日，如：

用户生日是：2010/04/29
结果应该是这样的：2岁4个月5天。

function getAge(dateString) {
    var today = new Date();
    var birthDate = new Date(dateString);
    var age = today.getFullYear() - birthDate.getFullYear();
    var m = today.getMonth() - birthDate.getMonth();
    if (m < 0 || (m === 0 && today.getDate() < birthDate.getDate())) {
        age--;
    }
    return age;
}

alert(getAge('2010/04/29'));

演示：http://jsfiddle.net/jFxb5/

Answer 1

试试这个：

js lang-js prettyprint-override">function getAge(dateString) {
    var today = new Date();
    var DOB = new Date(dateString);
    var totalMonths = (today.getFullYear() - DOB.getFullYear()) * 12 + today.getMonth() - DOB.getMonth();
    totalMonths += today.getDay() < DOB.getDay() ? -1 : 0;
    var years = today.getFullYear() - DOB.getFullYear();
    if (DOB.getMonth() > today.getMonth())
        years = years - 1;
    else if (DOB.getMonth() === today.getMonth())
        if (DOB.getDate() > today.getDate())
            years = years - 1;

    var days;
    var months;

    if (DOB.getDate() > today.getDate()) {
        months = (totalMonths % 12);
        if (months == 0)
            months = 11;
        var x = today.getMonth();
        switch (x) {
            case 1:
            case 3:
            case 5:
            case 7:
            case 8:
            case 10:
            case 12: {
                var a = DOB.getDate() - today.getDate();
                days = 31 - a;
                break;
            }
            default: {
                var a = DOB.getDate() - today.getDate();
                days = 30 - a;
                break;
            }
        }

    }
    else {
        days = today.getDate() - DOB.getDate();
        if (DOB.getMonth() === today.getMonth())
            months = (totalMonths % 12);
        else
            months = (totalMonths % 12) + 1;
    }
    var age = years + ' years ' + months + ' months ' + days + ' days';
    return age;
}

console.log(getAge("2010/02/28"));
console.log(getAge("2010/03/01"));

Answer 2

按年、月和日计算年龄。以任何有效的日期字符串格式输入日期，如“1952/09/28”、“1952年9月29日”、“1952年9月28日”等。

接受两个参数-出生日期和计算年龄的日期。你可以把第二个论点留到今天的日期。返回具有年、月和日属性的对象。

使用一年365.2425天的太阳年值。

@参数born Date出生日期。@参数ageAtDate计算年龄的日期。今天的日期无。@返回{{年：数，月：数，日：数}}

function getAge(birthDate, ageAtDate) {
    var daysInMonth = 30.436875; // Days in a month on average.
    var dob = new Date(birthDate);
    var aad;
    if (!ageAtDate) aad = new Date();
    else aad = new Date(ageAtDate);
    var yearAad = aad.getFullYear();
    var yearDob = dob.getFullYear();
    var years = yearAad - yearDob; // Get age in years.
    dob.setFullYear(yearAad); // Set birthday for this year.
    var aadMillis = aad.getTime();
    var dobMillis = dob.getTime();
    if (aadMillis < dobMillis) {
        --years;
        dob.setFullYear(yearAad - 1); // Set to previous year's birthday
        dobMillis = dob.getTime();
    }
    var days = (aadMillis - dobMillis) / 86400000;  
    var monthsDec = days / daysInMonth; // Months with remainder.
    var months = Math.floor(monthsDec); // Remove fraction from month.
    days = Math.floor(daysInMonth * (monthsDec - months));
    return {years: years, months: months, days: days};
}

Answer 3

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;
}


alert(getAge('09/09/1989'));

演示这里