compare datetimepicker values

Question

0.00/5 (No votes)

See more:

hii,
how to compare years between to datetimepickers such that there must be atleast 18 years of gap.
My code:

C#

if (dateTimePicker1.Value.Date.CompareTo(dateTimePicker2.Value.Date) < 18)
           {
               MessageBox.Show("minimum age must be 18 years");
           }

Is there any solution?

Posted 10-Mar-13 23:24pm

Dev Gupta from Mumbai,India

Add a Solution

3 solutions

Solution 1

Try this

C#

if((DateTimePicker1.Value-DateTimePicker2.Value).Year < 18)

Posted 10-Mar-13 23:42pm

pradiprenushe

Updated 11-Mar-13 0:41am

v3

Comments

Dev Gupta from Mumbai,India 11-Mar-13 5:56am

Its not working.In datetimepicker1 I took year 1990 & in datetimepicker2 I took year 2013.
Still messagebox is shown.I wrote this code in validating event of datetimepicker2

pradiprenushe 11-Mar-13 6:04am

Are you setting datetimepicker value from code?

Ian A Davidson 11-Mar-13 6:24am

You're comparing number of Days. The question was asking to compare Years.

Dev Gupta from Mumbai,India 11-Mar-13 7:47am

I had tried to compare it with years,bt result was just the same....

pradiprenushe 11-Mar-13 6:40am

@Dev Gupta from Mumbai,India Sorry my mistake. I have updated solution

Ian A Davidson 11-Mar-13 7:01am

Subtract returns a TimeSpan which doesn't have a Years (or Year!) property, so I don't believe this will work, as I say in my solution below.

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Sergey Alexandrovich Kryukov · Accepted Answer · 2013-03-11T04:39:00

Solution 3

This should be enough: you can use the operators '==', '!=', '<=', '>=', '<', and '>' with System.DateTime.

—SA

Posted 11-Mar-13 4:39am

Sergey Alexandrovich Kryukov

Comments

Ian A Davidson 11-Mar-13 10:47am

"Value" is a System.DateTime!
I expect you can indeed indeed use the operators, but in order to find out the number of Years difference, your options are a bit more limited because - unless you know something I don't - TimeSpan doesn't do years!

So you still either need to do what I suggested (add 18 years to the earlier DateTime) or use the more long-winded traditional route of comparing Year, then Month then Day, of the fashion:

int deltaY = y2 - y1;
if ((deltaY < 18) ||
((deltaY == 18) && ((m2 < m1) || ((m2 == m1) && (d2 < d1))))
{
// Warn
}

Regards,
Ian.

Sergey Alexandrovich Kryukov 11-Mar-13 11:29am

I can see your point, it's correct. I mostly responded to you "CompareTo". The use of the operator leaves less room for a bug, more readable...
—SA

Ian A Davidson · Accepted Answer · 2013-03-11T00:56:00

First of all, Value is the DateTime, so you don't need the ".Date" on the end.

Secondly, CompareTo just gives a boolean result to tell you if one date is earlier than the other.

Subtracting one date from the other results in a TimeSpan, which gives difference in days, hours, minutes... Not very helpful, obviously, because years are unfortunately not all the same length.

So the easiest solution would be to add 18 years to the earlier date.

C#

// Add 18 years to earlier date, and then compare it to the later date.
// Note we check to see if the result is greater than zero because
// if the difference is less than 18 years,
// the earlier date will now in fact be later.
if (dateTimePicker1.Value.AddYears(18).CompareTo(dateTimePicker2.Value) > 0)
{
	MessageBox.Show("minimum age must be 18 years");
}

Disclaimer: I've not tested this, so you may have to fix any typos yourself!

Regards,
Ian.