[.NET]計算年齡，包含年、月、日

2013-09-02

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.NET

要知道如何計算年齡，包含年、月、日?

有朋友想要知道如何計算年齡，包含年、月、日。

網路上有人分享出來(How to calculate an age based on a birthday?)，只是Code似乎有點問題，所以將它修改一下，如下，

public struct Age
{
	public int Years;
	public int Months;
	public int Days;
}
public static Age CalculateAge(DateTime birthDate, DateTime endDate)
{
	if (birthDate.Date > endDate.Date)
	{
		throw new ArgumentException("birthDate cannot be higher then endDate", "birthDate");
	}

	int years = endDate.Year - birthDate.Year;
	int months = 0;
	int days = 0;

	// Check if the last year, was a full year.
	if (endDate < birthDate.AddYears(years) && years != 0)
	{
		years--;
	}

	// Calculate the number of months.
	birthDate = birthDate.AddYears(years);

	if (birthDate.Year == endDate.Year)
	{
		months = endDate.Month - birthDate.Month;
	}
	else
	{
		months = (12 - birthDate.Month) + endDate.Month;
	}

	// Check if last month was a complete month.
	if (endDate < birthDate.AddMonths(months) && months != 0)
	{
		months--;
	}

	// Calculate the number of days.
	birthDate = birthDate.AddMonths(months);

	days = (endDate - birthDate).Days;
	Age result;
	result.Years = years;
	result.Months = months;
	result.Days = days;
	return result;
}

測試方式如下，

DateTime myBirthday = DateTime.ParseExact("1974/03/08", "yyyy/MM/dd", null);
DateTime flakNow = DateTime.ParseExact("2013/03/08", "yyyy/MM/dd", null);
Age myAge = CalculateAge(myBirthday, flakNow);