c# - 如何以月/年计算一个人的年龄？

Question

如何以月/年计算一个人的年龄，以使两岁以下的任何人都以月为单位报告，2 岁以上的人仅以年为单位报告？

Answer 1

我会为此使用NodaTime：

var d1 = new NodaTime.LocalDate(1997, 12, 10);
var d2 = new NodaTime.LocalDate(2012, 11, 13);

var period = NodaTime.Period.Between(d1, d2);
var m = period.Months;
var y = period.Years;

Answer 2

我已经在这个挑战中浪费了一个多小时，我认为这很简单。在另一个可能有用的 SO 问题上找到了这个答案

C# 格式化年龄 - 关于天、周、月 - 年

Answer 3

var now = DateTime.Today;

int months = 0;
while (true)
{
    var temp = dob.AddMonths((int)months);
    if (now < temp)
    {
        if (now.Day < temp.Day)
            months--; //accounts for short months
        break;
    }
    months++;
}

if (months < 24)
    return (months + " months");
else
    return (Math.Floor( (decimal)months / 12.0M) + " years");

Answer 4

private string Birthdate(DateTime birthday)
{
    var birthdayTicks = birthday.Ticks;
    var twoYearsTicks = birthday.AddYears(2).Ticks;
    var NowTicks = DateTime.Now.Ticks;

    var moreThanTwoYearsOld = twoYearsTicks < NowTicks;

    var age = new DateTime(DateTime.Now.Subtract(birthday).Ticks);

    return moreThanTwoYearsOld ? (age.Year-1).ToString() + " years" : (age.Year-1 >= 1 ? age.Month + 12 : age.Month).ToString() + " months";
}