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Aug 15th, 2010
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Calculate age based on DOB?

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Hey guys,
Im using asp.net in visual studio and im kinda new to the whole thing.
Im actually making a multi view form, and in the second view i need to calculate a persons age based on the date of birth that has been typed in view 1.Anyone know how to?I thnk its through regular expressions but we havent really been taught how to do that
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Roses89 is offline Offline
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Aug 16th, 2010
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Re: Calculate age based on DOB?
Lets say that your DOB is being display by a textbox id = "txtDOB" then you can do this.
ASP.NET Syntax (Toggle Plain Text)
  1. int years = DateTime.Today.Year - Convert.ToDateTime(txtDOB.Text).Year;
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jbisono is offline Offline
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Aug 17th, 2010
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Re: Calculate age based on DOB?
Hmmm..So how do i get years to be displayed in view two?
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Roses89 is offline Offline
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Aug 17th, 2010
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Re: Calculate age based on DOB?
What control do you want to render the age in?
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jbisono is offline Offline
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Aug 17th, 2010
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Re: Calculate age based on DOB?
The only drawback I can see with jbisono's suggestion is that it may not be 100% accurate. As an example, my B-Day is in December 1978... if we use the formula:
ASP.NET Syntax (Toggle Plain Text)
  1. int years = DateTime.Today.Year - Convert.ToDateTime(txtDOB.Text).Year;
Then what we get is 2010 - 1978 = 32. However, at least for the next few months, I'm still 31. It is possible, however, to extend jbisono's example to include the full range of date (year, month, day) and perform a more accurate subtraction that would take the partial year into account and provide a correct age. Just requires a bit more calculation and creativity
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Lusiphur is offline Offline
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Aug 17th, 2010
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Re: Calculate age based on DOB?
You are totally right Lusiphur. Thanks for correcting me. Roses89 if you need help to complete the code let us know.
Last edited by jbisono; Aug 17th, 2010 at 2:46 pm.
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jbisono is offline Offline
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Aug 18th, 2010
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Re: Calculate age based on DOB?
If you are using calender control then use the TimeSpan property.

Get one Calender Control,textbox and Button.

ASP.NET Syntax (Toggle Plain Text)
  1.  dt = Calendar1.SelectedDate
  2.         ts = Date.Now - dt
  3.         TextBox1.Text = ts.Days.ToString

dt is object of datetime, ts is for timespan

This code in Visual Studio Visual basic.
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