How Do I Calculate a Person's Age from Their DateTime Birthday?

Calculate the age according to DateTime's birthday

This article introduces how to calculate a person's age based on the birthday of DateTime.

Solution:

Calculate a person's age (in the year) based on the birthday of the DateTime type, please follow the steps below:

Store today's date in a variable called

.

1. Calculate the age by subtracting the birthday of the year: today.
2. By evaluating whether the person has been in the current year to adjust the leap year. If not, you will be reduced by 1. age = today.Year - birthdate.Year
Note:

<code class="language-csharp">// 保存今天的日期。
var today = DateTime.Today;

// 计算年龄。
var age = today.Year - birthdate.Year;

// 如果是闰年，则返回到此人出生的年份
if (birthdate.Date > today.AddYears(-age)) age--;</code>

This solution assumes that the concept of age is generally consistent with Western culture. If you need different cultural age definitions, such as East Asia's calculation methods, other factors may be considered.

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