通过生日获得当前年龄

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public static string ConvertToAge(DateTime birthday, DateTime referenceDate)
{
// 年龄的字符串表示
string strAge = string.Empty;

//显示的名称
string ageName = "岁";
string monthName = "月";
string dayName = "天";

// 岁
int intYear = 0;

// 月
int intMonth = 0;

// 天
int intDay = 0;

//当前日期
referenceDate = DateTime.Now.Date;

// 计算天数
intDay = referenceDate.Day - birthday.Day;
if (intDay < 0)
{
referenceDate = referenceDate.AddMonths(-1);
intDay += DateTime.DaysInMonth(referenceDate.Year, referenceDate.Month);
}

// 计算月数
intMonth = referenceDate.Month - birthday.Month;
if (intMonth < 0)
{
intMonth += 12;
referenceDate = referenceDate.AddYears(-1);
}

// 计算年数
intYear = referenceDate.Year - birthday.Year;

// 格式化年龄输出
// 年份输出
if (intYear >= 1)
{
strAge = intYear.ToString() + ageName;
}

if (intMonth > 0)
{
strAge += intMonth.ToString() + monthName;
}

if (intDay >= 0)
{
if (strAge.Length == 0 || intDay > 0)
{
strAge += intDay.ToString() + dayName;
}
}
return strAge;
}

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