Calculate Age in C# or JavaScript

A simple method to calculate age in years in C# and JavaScript. Additional info on the number of days in a year can be found here.

public static double CalculateAge(DateTime birthDate)
{
    double daysPerYear = 365.242199;
    TimeSpan span = DateTime.Now.Subtract(birthDate);
    double age = span.TotalDays / daysPerYear;

    return age;
}

JavaScript

function CalculateAge( birthDate )
{
    var msPerDay = 1000 * 60 * 60 * 24;
    var daysPerYear = 365.242199;
    var age = ( new Date() - new Date(birthDate) ) / msPerDay / daysPerYear;

    return age;
}

Tags: .Net, ASP.NET, C#, javascript

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