我希望从用户日期生日那里显示几天，几个月和几年的时间
这是我的代码，从这里开始：Calculate age in JavaScript
如何继续这个月和日，如：
用户生日是： 2010/04/29
结果应该是这样的： 2年，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'));
答案 0 :(得分：19)
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'));
答案 1 :(得分：1)
对于那些不希望受格式mm/dd/yyyy限制的人，您可以替换：
var dob = new Date(dateString.substring(6,10),
dateString.substring(0,2)-1,
dateString.substring(3,5)
);
使用：
var dob = new Date(dateString);
这允许我使用2012/09/30并仍然得到正确的答案。
答案 2 :(得分：1)
以年，月和日计算年龄。输入日期 在任何有效的日期字符串格式中，例如＆＃39; 1952/09 / 28＆＃39;，＆＃39; 1952年9月29日＆＃39;， ＆＃39 09 /一千九百五十二分之二十八＆＃39;等
取2个论点 - 出生日期和计算日期 年龄。您可以在今天的日期留下第二个参数。 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。
@param birthDate出生日期。 @param ageAtDate计算年龄的日期。没有 今天的约会。 @returns {{years：number，months：number，days：number}}
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};
}
答案 3 :(得分：1)
尝试一下：
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"));
答案 4 :(得分：0)
function CalculateAge(DobString) {
$("#age").val(getAge(DobString));
}
function getAge(dateString) {
var now = new Date('2019/01/20');
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(3, 5) - 1,
dateString.substring(0, 2)
);
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 + " " + age.days + dayString + " ";
else if ((age.years == 0) && (age.months == 0) && (age.days > 0))
ageString = " " + age.days + dayString + " ";
else if ((age.years > 0) && (age.months == 0) && (age.days == 0))
ageString = age.years + yearString + " ";
else if ((age.years > 0) && (age.months > 0) && (age.days == 0))
ageString = age.years + yearString + " " + age.months + monthString + " ";
else if ((age.years == 0) && (age.months > 0) && (age.days > 0))
ageString = age.months + monthString + " " + age.days + dayString + " ";
else if ((age.years > 0) && (age.months == 0) && (age.days > 0))
ageString = age.years + yearString + " " + age.days + dayString + " ";
else if ((age.years == 0) && (age.months > 0) && (age.days == 0))
ageString = age.months + monthString + " ";
else ageString = "Oops! Could not calculate age!";
return ageString;
}
答案 5 :(得分：0)
当我看到可接受的解决方案存在问题时（请参阅我的评论），在这里我提出自己的版本，该版本可以保证将出生日期仅增加1天就不会出现“跳数”。
此代码定义了一个更通用的DateInterval类，用于表示两个日期之间的时差。函数getAge然后成为基于该类的瘦实现。
class DateInterval {
constructor(start, end) { // two Date instances
if (start > end) [start, end] = [end, start]; // swap
this.days = end.getDate() - start.getDate();
this.months = end.getMonth() - start.getMonth();
this.years = end.getFullYear() - start.getFullYear();
if (this.days < 0) {
// Add the number of days that are left in the month of the start date
this.days += (new Date(start.getFullYear(), start.getMonth() + 1, 0)).getDate();
this.months--;
}
if (this.months < 0) {
this.months += 12;
this.years--;
}
}
toString() {
const arr = ["years", "months", "days"].map(p =>
this[p] && (this[p] + " " + p.slice(0, this[p] > 1 ? undefined : -1))
).filter(Boolean);
if (!arr.length) return "0 days";
const last = arr.pop();
return arr.length ? [arr.join(", "), last].join(" and ") : last;
}
}
function getAge(dateString) {
let today = new Date();
today.setHours(0,0,0,0);
let dob = new Date(dateString);
dob.setHours(0,0,0,0);
return new DateInterval(dob, today) + " old.";
}
// Demo: increment the date of birth by 1 at each test:
let d = new Date(2000, 1, 1);
setInterval(() => {
const s = d.toJSON().slice(0,10);
console.log("Someone born on " + s + " is now " + getAge(s));
d = new Date(d.getFullYear(), d.getMonth(), d.getDate() + 1);
}, 300);
答案 6 :(得分：0)
此功能将以年，月和日为单位给出年龄。它的工作原理是首先计算月份差异，然后将该数字添加到出生日期，然后计算天差异。这样做的好处是让Date对象担心Date年和每个月中天数的差异。
var nowDate = new Date(new Date().setHours(0, 0, 0, 0));
// Example date of birth.
var dobDate = new Date["03/31/2001"];
var years = nowDate.getFullYear() - dobDate.getFullYear();
var months = nowDate.getMonth() - dobDate.getMonth();
var days = nowDate.getDate() - dobDate.getDate();
// Work out the difference in months.
months += years * 12;
if (days < 0) {
months -= 1;
}
// Now add those months to the date of birth.
dobDate.setMonth(dobDate.getMonth() + months);
// Calculate the difference in milliseconds.
var diff = nowDate - dobDate;
// Divide that by 86400 to get the number of days.
var days = Math.round(diff / 86400 / 1000);
// Now convert months back to years and months.
years = parseInt(months / 12);
months -= (years * 12);
// Format age as "xx years, yy months, zz days"
var text = "";
if (years) {
text = years + (years > 1 ? " years" : " year");
}
if (months) {
if (text.length) {
text = text + ", ";
}
text = text + months + (months > 1 ? " months" : " month")
}
if (days) {
if (text.length) {
text = text + ", ";
}
text = text + days + (days > 1 ? " days" : " day")
}
if (nowDate == dobDate) {
text = "Newborn"
}
return text;