关于c＃：从datetime字段计算年龄，包括时间跨度

Calculating age from datetime field including time span

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我试着调用这个函数，它应该返回57的年龄，但是如果我今天运行它，它将返回58，2016年10月18日。

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DateTime myDate3test = Convert.ToDateTime("1958-10-17 13:45:59.473");
Console.WriteLine(CalculateAge(myDate3test)); //this should return 57 if run today October 18, 2016 since the person is not yet 58

public static string CalculateAge(DateTime dtDateOfBirth)
{
int age = 0;
DateTime dtNow = DateTime.Now;
string measurement = string.Empty;

if (DateTime.Compare(dtNow, dtDateOfBirth) == 1)
{
TimeSpan tsAge = dtNow.Subtract(dtDateOfBirth);
DateTime dtAge = new DateTime(tsAge.Ticks);

var vNowDate = Convert.ToInt32(dtNow.ToString("yyyyMMdd"));
var vBirthdate = Convert.ToInt32(dtDateOfBirth.ToString("yyyyMMdd"));
double diff = (vNowDate - vBirthdate) / 10000;
age = Convert.ToInt32(Math.Truncate(diff));

measurement =" year";

if (age == 0) // patient is not 1 year old yet
{
age = dtAge.Month - 1;
measurement =" month";

if (age == 0) // patient is not 1 month old yet
{
age = dtAge.Day - 1;
measurement =" day";
}
}
if (age > 1)
{
measurement +="s";
}
}
else
{
// Future date!!!
measurement =" Unable to calculate age";
age = -1;
}

return age.ToString() + measurement;
}

感谢您的帮助。