public static DateTime CalculateBirthDate(PersonAge personAge)
{
var birthDate = DateTime.Today;
var standardBirthDate = DateTime.Today;
if (null != personAge && personAge.Age > 0)
{
int intAge = (int)Math.Round(personAge.Age, MidpointRounding.ToEven);
switch (personAge.AgeUnit)
{
case "Y": //Years
birthDate = DateTime.Today.AddYears(-intAge);
break;
case "M": //Months
birthDate = DateTime.Today.AddMonths(-intAge);
break;
case "D": //Days
birthDate = DateTime.Today.AddDays(-intAge);
break;
}
standardBirthDate = new DateTime(birthDate.Year, 6, 15);
if (standardBirthDate > DateTime.Today)
{
return(birthDate);
}
}
return(standardBirthDate.Date);
}
public static PersonAge CalculateAge(DateTime Bday, DateTime Cday)
{
var personAge = new PersonAge(0);
if ((Cday.Year - Bday.Year) > 0 ||
(((Cday.Year - Bday.Year) == 0) && ((Bday.Month < Cday.Month) ||
((Bday.Month == Cday.Month) && (Bday.Day <= Cday.Day)))))
{
int DaysInBdayMonth = DateTime.DaysInMonth(Bday.Year, Bday.Month);
int DaysRemain = Cday.Day + (DaysInBdayMonth - Bday.Day);
if (Cday.Month > Bday.Month)
{
personAge.Years = Cday.Year - Bday.Year;
personAge.Months = Cday.Month - (Bday.Month + 1) + Math.Abs(DaysRemain / DaysInBdayMonth);
personAge.Days = (DaysRemain % DaysInBdayMonth + DaysInBdayMonth) % DaysInBdayMonth;
}
else if (Cday.Month == Bday.Month)
{
if (Cday.Day >= Bday.Day)
{
personAge.Years = Cday.Year - Bday.Year;
personAge.Months = 0;
personAge.Days = Cday.Day - Bday.Day;
}
else
{
personAge.Years = (Cday.Year - 1) - Bday.Year;
personAge.Months = 11;
personAge.Days = DateTime.DaysInMonth(Bday.Year, Bday.Month) - (Bday.Day - Cday.Day);
}
}
else
{
personAge.Years = (Cday.Year - 1) - Bday.Year;
personAge.Months = Cday.Month + (11 - Bday.Month) + Math.Abs(DaysRemain / DaysInBdayMonth);
personAge.Days = (DaysRemain % DaysInBdayMonth + DaysInBdayMonth) % DaysInBdayMonth;
}
}
else
{
throw new ArgumentException("Birthday date must be earlier than current date");
}
if (personAge.Years >= 1)
{
personAge.Age = personAge.Years;
personAge.AgeUnit = "Y";
}
else
{
if (personAge.Months >= 1)
{
personAge.Age = personAge.Months;
personAge.AgeUnit = "M";
}
else
{
if (personAge.Days >= 1)
{
personAge.Age = personAge.Days;
personAge.AgeUnit = "D";
}
}
}
return(personAge);
}
