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date calculation in forms

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Aug 18.2003

Is it possible to input a date in a form that uses the system date to calculate a persons age?

If that is possible, how can I set an alert if the age does not fall between an upper and lower age limit eg 18 to 30?

I can sort out the input for the date and I can automatically set ‘today’s date’ in another field, but thereafter it gets a bit foggy – hope someone can help please.

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JavaScript

3 Comments(s) ↴

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@requestcodeAug 18.2003 — Here is a link to a script that calculates your age in different units. Maybe it will help:

http://www.javascriptkit.com/script/script2/agefind.shtml
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@janixauthorAug 19.2003 — Thanks, that has helped a little but I'm still not sure how to set up an alert if someone falls outside the age range.
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@GollumAug 19.2003 — well if...
<i>
</i>var now = new Date();
// and
var birthday = new Date(y,m,d);
// then
var age = now.getYear() - birthday.getYear();
var tmp = new Date(now.getYear(),m,d);
if ( tmp.getTime() &gt; now.getTime() ) age--;
// so
if ( (age &lt; 18) || (age &gt;= 31) ) alert("You're either too old or too young to enjoy this holiday package.");
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