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.NET Forum / Languages / C# / March 2008How to compute age
How to compute the age of a person? For example, a person with birthday of 1964/09/25. How to compute his age with c#? simply substract two DataTime values, u will get TimeSpan object. then u can convert it to a suitable string Look at the DateTime.Subtract method, which will subtract two dates, returning a TimeSpan, which will tell you the number of years the two dates are apart. One of your DateTimes would be DateTime.Now, the other the date of the person's birth. > How to compute the age of a person? > For example, a person with birthday of 1964/09/25. > How to compute his age with c#? {sample} private void button1_Click_1(object sender, System.EventArgs e) { DateTime d1=DateTime.Now; DateTime d2=DateTime.Now; try { d2=Convert.ToDateTime(textBox1.Text); } catch (Exception){} MessageBox.Show( "Your age is "+(d1.Year-d2.Year).ToString() ); } > Look at the DateTime.Subtract method, which will subtract two dates, > returning a TimeSpan, [quoted text clipped - 5 lines] > > For example, a person with birthday of 1964/09/25. > > How to compute his age with c#? sorry about the previous post ;-) using System; namespace CommonLib { public class DateRoutines { #region Methods public static int GetAge(DateTime aBirthDate) { TimeSpan span=DateTime.Now.Subtract(aBirthDate); return span.Days/365; } #endregion Methods } } > {sample} > private void button1_Click_1(object sender, System.EventArgs e) [quoted text clipped - 20 lines] > > > For example, a person with birthday of 1964/09/25. > > > How to compute his age with c#? int age = DateTime.Now.Year - DateOfBirth.Year + (DateTime.Now.DayOfYear < DateOfBirth.DayOfYear ? -1 : 0); // e.g., if date of birth is Juy 4, 1976: DateTime DateOfBirth = new DateTime(1976, 7, 4); int age = DateTime.Now.Year - DateOfBirth.Year + (DateTime.Now.DayOfYear < DateOfBirth.DayOfYear ? -1 : 0); From http://www.developmentnow.com/g/36_2005_5_0_0_517919/How-to-compute-age.ht Notice a bug in my code From http://www.developmentnow.com/g/36_2005_5_0_0_517919/How-to-compute-age.ht > Notice a bug in my code? > [quoted text clipped - 3 lines] > Posted via DevelopmentNow.com Groups > http://www.developmentnow.com Two words: leap year. ;-) how about: DateTime DateOfBirth = new DateTime(1976, 7, 4); DateTime ThisDay = DateTime.Now.Date; DateTime Birthday = new DateTime(ThisDay.Year, DateOfBirth.Month, DateOfBirth.Day); int age = ThisDay.Year - DateOfBirth.Year + (ThisDay < Birthday? -1 : 0); If your timing was great, the two different uses of DateTime.Now could be on different dates. Only problematic I believe, if the second one is the birthday date. > Notice a bug in my code? > > From http://www.developmentnow.com/g/36_2005_5_0_0_517919/How-to-compute-age.htm > > Posted via DevelopmentNow.com Groups > http://www.developmentnow.com Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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