How to calculate the number of years between 2 dates?

Question

I would like to compare 2 dates to confirm that the number of years between is >= 18. For example, if my 2 dates are 03-12-2011 and 03-12-1983 then this should pass validation, however, if my 2 dates are 03-12-2011 and 03-12-1995 then this should fail validation.

Can anyone help me?

The `DateTime` class has several handy methods, have you tried any? — C.Evenhuis, Nov 25 '11 at 12:35

score 18 · Accepted Answer · edited Mar 14 '17 at 02:58

18

hope this is what you are looking for

public bool CheckDate(DateTime date1, DateTime date2)
{
    return date1.AddYears(-18) < date2;
}

edited Mar 14 '17 at 02:58

Rob

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answered Nov 25 '11 at 12:34

Bhavik Goyal

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OP is looking for years, not days. He should use AddYears instead – Michiel van Vaardegem Nov 25 '11 at 12:36

James · Answer 2 · 2011-11-25T13:04:34.647

I re-jigged your question title & description to make it a bit more clear. From what I gathered from your original post you are looking for an Age Verification function. Here is what I would do:

function VerifyAge(DateTime dateOfBirth)
{
    DateTime now = DateTime.Today; 
    int age = now.Year - dateOfBirth.Year;
    if (now.Month < dateOfBirth.Month || (now.Month == dateOfBirth.Month && now.Day < dateOfBirth.Day)) 
        age--;
    return age >= 18; 
}

score 1 · Answer 3 · answered Nov 25 '11 at 12:33

1

Use TimeSpan structure.

TimeSpan span= dateSecond - dateFirst;
int days=span.Days;
//or
int years = (int) (span.Days / 365.25);

answered Nov 25 '11 at 12:33

KV Prajapati

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OP is looking for years, not days – Michiel van Vaardegem Nov 25 '11 at 12:35

score 0 · Answer 4 · edited May 23 '17 at 10:29

0

DateTime zeroTime = new DateTime(1, 1, 1);

DateTime a = new DateTime(2008, 1, 1);
DateTime b = new DateTime(2016, 1, 1);

TimeSpan span = b - a;
// because we start at year 1 for the Gregorian 
// calendar, we must subtract a year here.
int years = (zeroTime + span).Year - 1; 

Console.WriteLine("Years elapsed: " + years);

Refrence Link

edited May 23 '17 at 10:29

Community

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answered May 26 '16 at 12:04

Durgesh Pandey

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score 0 · Answer 5 · answered Jun 10 '22 at 13:32

0

Try this.... Using this you can get the exact no of years between two days. Only you need to do is divide the date difference by 365.25

 TimeSpan span = DateTime.Parse(To_Date) - DateTime.Parse(From_Date);
 int years = (int)(span.Days / 365.25);

answered Jun 10 '22 at 13:32

Lakshan Dhanasekara

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score 0 · Answer 6 · answered Nov 25 '11 at 12:33

0

Check the TimeSpan structure: http://msdn.microsoft.com/en-us/library/system.timespan.aspx

answered Nov 25 '11 at 12:33

CodeZombie

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score 0 · Answer 7 · answered Nov 25 '11 at 12:36

0

Use Timespan:

TimeSpan day = 03-12-2011 - 03-12-1983;
                double year = day.TotalDays / 365.25;

                if (year > 18)
                {

                }

Maybe instead of 03-12-2011 you should use DateTime.Now

answered Nov 25 '11 at 12:36

Oedum

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score 0 · Answer 8 · answered Nov 25 '11 at 12:58

0

Here's a method to check if the age is more than 18:

    private bool IsMoreThan18(DateTime from, DateTime to)
    {
        int age = to.Year - from.Year;
        if (from > to.AddYears(-age)) age--;
        return age >= 18;
    }

answered Nov 25 '11 at 12:58

JiBéDoublevé

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score -1 · Answer 9 · answered Nov 25 '11 at 12:35

-1

Create two DateTime objects and substract them from eachother. The result is a DateTime object aswel:

DateTime dt = new DateTime(2011, 12, 03);
DateTime dt2 = new DateTime(1983, 12, 03);
DateTime dt3 = dt - dt2;

Now you can check dt3.Year for the number of years between them

answered Nov 25 '11 at 12:35

Michiel van Vaardegem

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didn't you mean TimeSpan dt3 ? – Mark Nov 25 '11 at 12:36
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`TimeSpan` has no year property. – Johannes Kommer Nov 25 '11 at 12:43

How to calculate the number of years between 2 dates?

9 Answers9