如何使用 react js 计算下一个生日？

Question

当前出生日期详细信息如下： Date: "1998-06-16T21:50:20.750Z", Age: 24

Answer 1

让我们假设您的日期对象是一个字符串。那么，下面的方法应该会有所帮助。唯一的问题是它没有考虑到 2 月 29 日的生日。必须根据要求进行处理

function nextBirthday(birthDate){
    const birthDateObj = new Date(birthDate);
    const today =  new Date();
    let nextBirthday = new Date(today.getFullYear(),birthDateObj.getMonth(),birthDateObj.getDate());

    if(nextBirthday<today){
        nextBirthday.setFullYear(today.getFullYear()+1)
    }

    console.log(nextBirthday.toString())
    return nextBirthday
}

nextBirthday("1998-05-16T00:00:00.000Z");

P.S - 您可以直接单独使用 Javascript 来完成此操作（在 React 中也是如此）

评论答案：

function nextBirthday(birthDate){
    const birthDateObj = new Date(birthDate);
    const today =  new Date();
    let nextBirthday = new Date(today.getFullYear(),birthDateObj.getMonth(),birthDateObj.getDate());

    if(nextBirthday<today){
        nextBirthday.setFullYear(today.getFullYear()+1)
    }

    return nextBirthday
}

function daysBetweenDates(laterDate, earlierDate) {
const timeDifference = laterDate.getTime()-earlierDate.getTime(); //gets time difference between 2 dates in milliseconds 
const daysDifference = Math.ceil( timeDifference/(1000*60*60*24));
return daysDifference
}


console.log(daysBetweenDates(nextBirthday("1998-05-16T00:00:00.000Z"),new Date()));