Question

可能重复：
How do I calculate someone's age in C#?

如何计算某个人在给定日期的年龄？

我有出生日期，而我现在正在做的事情，我想要计算它的日期是年末，例如31/12/2012 23:59:59。

我如何根据这些变量计算出一个人年底的年龄？

感谢。

Answer 1

减去目标日期和出生日期的年份;如果目标日期在该年的出生日期之前，则减去1年。

Answer 2

DateTime birthDayPersonA = new DateTime(1986,12,1);
DateTime givenDate = new DateTime(2012,12,24);
TimeSpan age = givenDate.Substract(birthDayPersonA);

Answer 3

您可以执行以下操作：

使用出生日期创建DateTime实例
使用目的地创建DateTime实例（例如，31/12/2012 23:59:59）;
使用第二个DateTime实例上的Subtract方法获取这两个日期之间的年份并将其添加到用户年龄

Answer 4

var age = new Timespan(endOfYearDate.Ticks - dateOfBirth.Ticks).TotalDays();

或者只是几天，如果你想让它围绕你。

注意您需要将天数转换为年数除以365.25

Answer 5

var birthday = new DateTime(1973, 7, 10);
var date = new DateTime(2012, 12, 31);

TimeSpan span = date - birthday;

DateTime age = DateTime.MinValue + span;

// MinValue is 1/1/1 so we have to subtract one year
int yearsOfAge = age.Year - 1;

Answer 6

VB有DataDiff，C＃并不完全。使用以下类

public enum DateInterval
    {
        Day,
        DayOfYear,
        Hour,
        Minute,
        Month,
        Quarter,
        Second,
        Weekday,
        WeekOfYear,
        Year
    }

    public class DateAndTime
    {
        public static long DateDiff(DateInterval interval, DateTime dt1, DateTime dt2)
        {
            return DateDiff(interval, dt1, dt2, System.Globalization.DateTimeFormatInfo.CurrentInfo.FirstDayOfWeek);
        }

        private static int GetQuarter(int nMonth)
        {
            if (nMonth <= 3)
                return 1;
            if (nMonth <= 6)
                return 2;
            if (nMonth <= 9)
                return 3;
            return 4;
        }

        public static long DateDiff(DateInterval interval, DateTime dt1, DateTime dt2, DayOfWeek eFirstDayOfWeek)
        {
            if (interval == DateInterval.Year)
                return dt2.Year - dt1.Year;

            if (interval == DateInterval.Month)
                return (dt2.Month - dt1.Month) + (12 * (dt2.Year - dt1.Year));

            TimeSpan ts = dt2 - dt1;

            if (interval == DateInterval.Day || interval == DateInterval.DayOfYear)
                return Round(ts.TotalDays);

            if (interval == DateInterval.Hour)
                return Round(ts.TotalHours);

            if (interval == DateInterval.Minute)
                return Round(ts.TotalMinutes);

            if (interval == DateInterval.Second)
                return Round(ts.TotalSeconds);

            if (interval == DateInterval.Weekday)
            {
                return Round(ts.TotalDays / 7.0);
            }

            if (interval == DateInterval.WeekOfYear)
            {
                while (dt2.DayOfWeek != eFirstDayOfWeek)
                    dt2 = dt2.AddDays(-1);
                while (dt1.DayOfWeek != eFirstDayOfWeek)
                    dt1 = dt1.AddDays(-1);
                ts = dt2 - dt1;
                return Round(ts.TotalDays / 7.0);
            }

            if (interval == DateInterval.Quarter)
            {
                double d1Quarter = GetQuarter(dt1.Month);
                double d2Quarter = GetQuarter(dt2.Month);
                double d1 = d2Quarter - d1Quarter;
                double d2 = (4 * (dt2.Year - dt1.Year));
                return Round(d1 + d2);
            }

            return 0;

        }

        private static long Round(double dVal)
        {
            if (dVal >= 0)
                return (long)Math.Floor(dVal);
            return (long)Math.Ceiling(dVal);
        }
    }

用法是

public long HowOldAmIToday(DateTime DOB)
{
    return DateAndTime.DateDiff(DateInterval.Year, DOB, DateTime.Today);
}

如何计算给定日期的人年龄

6 个答案: