Library code snippets
Calculate Age
By James Crowley, published on 20 Feb 2005
Calculating someone's age is pretty straightforward, and here's how! In order for the code to work, you need a DateTime object called BirthDate containing the birthday.
C#
// get the difference in years
int years = DateTime.Now.Year - BirthDate.Year;
// subtract another year if we're before the
// birth day in the current year
if (DateTime.Now.Month < BirthDate.Month ||
(DateTime.Now.Month == BirthDate.Month &&
DateTime.Now.Day < BirthDate.Day))
years--;
VB.NET
' get the difference in years
Dim years As Integer = DateTime.Now.Year - BirthDate.Year
' subtract another year if we're before the
' birth day in the current year
If DateTime.Now.Month < BirthDate.Month Or (DateTime.Now.Month = BirthDate.Month And DateTime.Now.Day < BirthDate.Day) Then
years = years - 1
End If
James first started this website when learning Visual Basic back in 1999 whilst studying his GCSEs. The site grew steadily over the years while being run as a hobby - to a regular monthly audience ...
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Alternative solution:
DateTime comparisonDate = new DateTime(_birthday.Year, DateTime.Now.Month, DateTime.Now.Day);
int age = (comparisonDate.Date < _birthday.Date) ?DateTime.Now.Year - _birthday.Year - 1:
DateTime.Now.Year - _birthday.Year;
Description of calculate age and working principle
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