Question

我制作了一个具有输入日期输入和年龄输入的反应成分，可以在数年，数月和数天内输入。

因此，如果输入年龄，我想获得该人的出生日期。

例如，年龄为年= 24，月数= 1，天数= 15 所以出生日期应该是18-04-1993 ..

这是我到目前为止所做的事情。但是，如果（nowDay＆lt; = ageDay）阻止了逻辑正在破坏..

const now = new Date();
const nowDay = now.getDate();
const nowMonth = now.getMonth() + 1;
const nowYear = now.getFullYear();
const ageYear = ReactDOM.findDOMNode(this.yearInput).value;
const ageMonth = ReactDOM.findDOMNode(this.monthInput).value;
const ageDay = ReactDOM.findDOMNode(this.daysInput).value;
let dobYear = nowYear - ageYear;
let dobMonth = nowMonth - ageMonth;
let dobDay = nowDay - ageDay;
if (dobMonth <= 0) {
  dobYear --;
  dobMonth = (12 + dobMonth);
}
if (ageMonth > 12) {
  dobYear = dobYear + Math.floor(dobMonth / 12);
  console.log('ASIJASOIJAS', dobYear); // eslint-disable-line
  dobMonth = ageMonth % 12;
}
if (nowDay <= ageDay) {
  dobMonth -= Math.floor(ageDay / 30);
  dobDay = ageDay % 30;
  if (dobMonth < 0) {
    dobYear = dobYear - (dobMonth % 12) - 1;
    dobMonth = 12 - (dobMonth % 12);
    dobDay ++;
  }
}
const age = {
  days: ageDay,
  months: ageMonth,
  years: ageYear,
};
const month = dobMonth < 10 ? `0${dobMonth}` : dobMonth;
const day = dobDay < 10 ? `0${dobDay}` : dobDay;
dateOfBirth = `${dobYear}-${month}-${day}`;

提前致谢。

Answer 1

如果您不想按照上面的评论中的建议使用momentjs，那么这样的简单函数就可以解决问题。请注意，它返回一个Date对象，因此您必须将其格式化为您想要的任何字符串格式。

const getBirthDateFromAge = (ageYears, ageMonths, ageDays) => {
  const date = new Date();
  date.setFullYear(date.getFullYear() - ageYears);
  date.setMonth(date.getMonth() - ageMonths);
  date.setDate(date.getDate() - ageDays);
  return date;
};

console.log(getBirthDateFromAge(10, 9, 4));

Answer 2

在nodejs es6中：

const leapyear = ( year ) => {
    return year % 100 === 0 ?
        year % 400 ===
        0 : year % 4 === 0;
}

const countDaysByYears = ( year ) => {
    let currentYear = new Date().getFullYear();
    let count = 0;
    while ( year != 0 ) {
        if ( leapyear( currentYear ) ) count++;
        year -= 1;
        currentYear -= 1;
    }
    return count;
}

const getMyDoB = ( years, months, days ) => {
    months = ( months / 12 );
    days = ( ( days + countDaysByYears( years ) ) / 365 );
    var ageInYears = years + months + days;
    var ageInMillis = ageInYears * 365 * 24 * 60 * 60 * 1000;
    return new Date( Date.now() - ageInMillis );
}

console.log( getMyDoB( 31, 7, 19 ).toDateString() );
console.log( getMyDoB( 25, 0, 24 ).toDateString() );

从年龄到出生日期的逻辑以年月和日表示

2 个答案: