How to calculate an age based on a birthday

Question

Possible Duplicate    How do I calculate someone rsquo s age in C         I want to write an ASP NET helper method which returns the age of a person given his or her birthday   I ve tried code like this   public static string Age this HtmlHelper helper  DateTime birthday        return  DateTime Now - birthday            But it s not working  What is the correct way to calculate the person s age based on their birthday

User · Answer

I don t really understand why you would make this an HTML Helper  I would make it part of the ViewData dictionary in an action method of the controller  Something like this   ViewData  Age     DateTime Now Year - birthday Year    Given that birthday is passed into an action method and is a DateTime object

User · Answer

Another clever way from that ancient thread   int age         Int32 Parse DateTime Today ToString  yyyyMMdd    -      Int32 Parse birthday ToString  yyyyMMdd       10000

User · Answer

Stackoverflow uses such function to determine the age of a user   Calculate age in C   The given answer is  DateTime now   DateTime Today  int age   now Year - bday Year  if  now  lt  bday AddYears age   age--    So your helper method would look like  public static string Age this HtmlHelper helper  DateTime birthday        DateTime now   DateTime Today      int age   now Year - birthday Year      if  now  lt  birthday AddYears age   age--       return age ToString        Today  I use a different version of this function to include a date of reference  This allow me to get the age of someone at a future date or in the past  This is used for our reservation system  where the age in the future is needed   public static int GetAge DateTime reference  DateTime birthday        int age   reference Year - birthday Year      if  reference  lt  birthday AddYears age   age--       return age

User · Answer

I do it like this    Shortened the code a bit   public struct Age       public readonly int Years      public readonly int Months      public readonly int Days      public Age  int y  int m  int d     this         Years   y      Months   m      Days   d     public static Age CalculateAge   DateTime birthDate  DateTime anotherDate         if  startDate Date  gt  endDate Date                         throw new ArgumentException   startDate cannot be higher then endDate    startDate                       int years   endDate Year - startDate Year          int months   0          int days   0              Check if the last year  was a full year          if  endDate  lt  startDate AddYears  years   amp  amp  years    0                         years--                        Calculate the number of months          startDate   startDate AddYears  years            if  startDate Year    endDate Year                         months   endDate Month - startDate Month                    else                       months     12 - startDate Month     endDate Month                        Check if last month was a complete month          if  endDate  lt  startDate AddMonths  months   amp  amp  months    0                         months--                        Calculate the number of days          startDate   startDate AddMonths  months            days     endDate - startDate   Days           return new Age  years  months  days         Implement Equals  GetHashCode  etc    as well    Overload equality and other operators  etc

[c#] How to calculate an age based on a birthday?

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