calculate age from date of birth

[TJS]

what namespaces are required so I can do a simple calculate age from date of
birth ?

 

[Kevin Spencer]

System.DateTime

--
HTH,

Kevin Spencer
Microsoft MVP
..Net Developer
http://www.takempis.com
Big Things are made up of
Lots of Little Things.

 

[Chris Bower]

In VB you can just use the DateDiff function, in C# use the TimeSpan
structure.

 

[TJS]

I added

"Imports System.DateTime" to my vb file, but keep getting error on
"datediff" when I try to compile ?

 

[TJS]

I added

"Imports System.DateTime" to my vb file, but keep getting error on
"datediff" when I try to compile ?

 

[Chris Bower]

DateDiff is a function in the Microsoft.VisualBasic namespace.

 

[Chris Bower]

Oh and System.DateTime is a structure, not a namespace.

 

[TJS]

that worked

thanks

DateDiff is a function in the Microsoft.VisualBasic namespace.

 

[Kevin Spencer]

And the error was?...

--
HTH,

Kevin Spencer
Microsoft MVP
..Net Developer
http://www.takempis.com
Big Things are made up of
Lots of Little Things.

 

[gosborne]

Some extension methods that may help

Here are some extension methods I frequently use when needing to calculate age. The first two extend TimeSpan to add a Years and TotalYears value to TimeSpan, the second extends a DateTime to give an Age (int) when passed a date to calculate the age from.

Namespace MyFunctions
    static class MyExtensions

        private const double YEAR_CALC = 365.2425;

        public static int Years(this TimeSpan ts) {
            return (int)Math.Floor(ts.TotalYears());
        }
        public static double TotalYears(this TimeSpan ts) {
            return ((double)ts.Days) / YEAR_CALC;
        }
        public static int Age(this DateTime dob, DateTime fromDate) {
            TimeSpan ts = fromDate.Subtract(dob);
            int age = ts.Years();
            [COLOR="green"]//will never return negative years - if this is desired, [/COLOR]
            [COLOR="green"]// just return age[/COLOR]
            return Math.Abs(age);
        }
    }
}

To use these, just add the following to the top of your class and the methods will be available on each of those types.

using MyFunctions.MyExtensions;