what is the simplest and correct way to calculate age?

2018-06-19 07:14:26

Possible Duplicate:
How do I calculate someone's age in C#?

Hi, Simple question. Need to calculate age and only allow people who are 21. Do you use timespan? so given somebody inputting a date i need to check if they are >=21.

suggestions?

The easiest way isn't to actually calculate their age - it's to see whether their birthday is after your limit:

DateTime twentyOneYearsAgo = DateTime.Today.AddYears(-21);

if (birthDate > twentyOneYearsAgo)
{
    // Sorry, you're too young
}

Note that on February 29th on a leap year, the AddYears will return February 28th on the relevant earlier year. That's probably what you want in this case, if the user has entered an actual date.

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