CODEWITHSUNDEEP
c#winforms
saravana kumar
saravana kumar

Reputation: 31

I want to calculate the ones year of birth by taking his current age,

I want to calculate the ones year of birth by taking his current age, for eg his age is 30, in datetimepicker box the date should be displayed as 01/01/1982. It should be auto calculation.

         int todayyears = int.Parse (DateTime.Now.Year.ToString());

        int a = int.Parse (int.Parse(txt_age.Text).ToString());

        string dif = (todayyears - a).ToString();

        txt_dob.Text = dif;

Here txt_age is input value given, txt_dob is diaplayed the date of birth automatically after the input given in txt_age.

Upvotes: 0

Views: 448

Answers (5)

Renatas M.
Renatas M.

Reputation: 11820

Should be something like that:

txt_dob.Text = DateTime.Now.AddYears(int.Parse(txt_age.Text) * -1).ToString("01/01/yyyy");

Upvotes: 2

IAmGroot
IAmGroot

Reputation: 13855

You can create a datetime with the given year.

So calculate the year. ( Current year - Age in Years). 

int Age = 30; // obtain from your given field.
int YofBirth = DateTime.Now.Year - Age;

DateTime d = new DateTime(YofBirth , 1, 1);

Then use this Datetime d to set the field.

Upvotes: 2

Arion
Arion

Reputation: 31239

Something like this:

int age;
if(int.TryParse(txt_age.Text,out age))
{
    txt_dob.Text= new DateTime(DateTime.Now.Year-age,1,1).ToShortDateString();
}

Upvotes: 0

PraveenVenu
PraveenVenu

Reputation: 8337

Try this

int todayyears = DateTime.Now.Year;
            int a = int.Parse(txt_age.Text);
            string dob = new DateTime(todayyears - a, DateTime.Today.Month, DateTime.Today.Day);
txt_dob.Text=dob;

Upvotes: 1

Jon Skeet
Jon Skeet

Reputation: 1500495

It looks like you're converting way too many things to strings, for no reason.

If you always want to display January 1st, you just need:

// Note: use int.TryParse to avoid exceptions if the user input isn't an integer
int age = int.Parse(txt_age.Text);

DateTime date = new DateTime(DateTime.Today.Year - age, 1, 1);

txt_dob.Text = date.ToString(); // Or use a specific format

Note that "dob" in "txt_dob" is inappropriate, as this isn't the user's date of birth, just January 1st in their year of birth which is very different.

Upvotes: 6

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