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How Do I Calculate a Person's Age from Their Birthdate (DateTime)?

Susan Sarandon

Feb 02, 2025 am 07:46 AM

How Do I Calculate a Person's Age from Their Birthdate (DateTime)?

Calculate the age according to the date of birth

The DateTime type, known as a personal birthday, is a simple task to determine that their age (in the year) is a simple task.

Solution

To calculate someone’s age based on DateTime's birthday, please follow the steps below:

Determine the difference between the year of today and the birth of birth: DateTime today = DateTime.Today;.
Adjust the age when necessary to consider the leap year. If the person's birthday has not passed this year (int age = today.Year - birthdate.Year;), the age will be reduced by 1:
birthdate.Date > today.AddYears(-age) if (birthdate.Date > today.AddYears(-age)) age--; Precautions

This calculation assumes that the concept of "Western" is used, and the age increases on the day of birthday. In contrast, in the "East Asian algorithm", the first day of the new year increased. For more complicated age calculations, consider using a library or calendar system that considers regional customs.

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