Calculate age from date and month only JS答案

【问题标题】：Calculate age from date and month only JSCalculate age from date and month only JS
【发布时间】：2022-12-02 01:05:56
【问题描述】：

dob format is 2022-07

desired output is 0 Years 5 Months

Below is the code I tried but I am getting months in negative.

export default function calculateAge(date) {
  let month = new Date().getMonth() - Number(date.split("-")[1]);
  let year = new Date().getFullYear() - Number(date.split("-")[0]);
  console.log(`month is`, month);

  if (month < 0 && year < 1) {
    month = year * 12 + month;
    year = 0;
  }

  console.log(`year`, year);

  return `${year ? `${year} Year${year > 1 ? `s` : ""}` : ""} ${
    month ? `${month} Month${month > 1 ? "s" : ""}` : ""
  }`;
}

【问题讨论】：

标签： javascript date

【解决方案1】：

function calculateAge(date) {
  // Split the date string into year and month
  const [year, month] = date.split("-");

  // Get the current year and month
  const currentYear = new Date().getFullYear();
  const currentMonth = new Date().getMonth() + 1; // months are 0-indexed in JavaScript

  // Calculate the difference in years and months
  let ageYears = currentYear - Number(year);
  let ageMonths = currentMonth - Number(month);

  // If the age in months is negative, subtract 1 from the age in years and add 12 to the age in months
  if (ageMonths < 0) {
    ageYears -= 1;
    ageMonths += 12;
  }

  // Return the age in years and months as a string
  return `${ageYears ? `${ageYears} Year${ageYears > 1 ? `s` : ""}` : ""} ${
    ageMonths ? `${ageMonths} Month${ageMonths > 1 ? "s" : ""}` : ""
  }`;
}

【讨论】：

【解决方案2】：

function calculateAge(date) {
  const now = new Date()
  const then = new Date(date.split('-'))

  const diff = new Date(now - then)
  const months = diff.getMonth()
  const years = diff.getUTCFullYear() - 1970

  return `${years} ${years !== 1 ? 'Years' : 'Year'} ${months} ${months !== 1 ? 'Months' : 'Month'}`
}

const age = calculateAge('2010-05')
console.log(age)

【讨论】：