Solved

Vb.Net - Compare Dates

Posted on 2013-05-16
9
327 Views
Last Modified: 2013-05-16
Good Day Experts!

I have two textboxes that accept start and end dates.  I have a routine that checks if the dates are formatted in acceptable formats.  That part works great.  The last step of the routine I want to check if the start date is less than the end date.  However, I am apparently doing something wrong since 1/1/2103 is not flagged as greater than 5/17/2013.  Here is my compare:

If txtStartPW.Text.Trim > txtEndPW.Text.Trim Then
   ValidationResult = "Start Date is not less than End Date. Please revise your entry."
End If

It "feels" like it is going to be something related to the values being strings and not comparing the actual dates...but, I am not good with coding around date stuff.

Can you help?

Thanks,
jimbo99999
0
Comment
Question by:Jimbo99999
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
9 Comments
 
LVL 23

Expert Comment

by:Ioannis Paraskevopoulos
ID: 39171346
Hi,

What are the valid formats? Is it only M/D/YYYY?

Giannis
0
 
LVL 34

Accepted Solution

by:
Paul MacDonald earned 300 total points
ID: 39171351
If CDate(txtStartPW.Text.Trim)CDate(txtEndPW.Text.Trim) Then
   ValidationResult = "Start Date is not less than End Date. Please revise your entry."
End If


...or something to that affect.
0
 
LVL 13

Expert Comment

by:Philip Pinnell
ID: 39171357
Yes, do as above because as strings 1/1/2103 is less than 5/17/2013.
0
Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 

Author Comment

by:Jimbo99999
ID: 39171358
"M/d/yyyy", "MM/dd/yyyy", "M/dd/yyyy", "MM/d/yyyy"
0
 
LVL 42

Assisted Solution

by:sedgwick
sedgwick earned 150 total points
ID: 39171364
If DateTime.Parse(txtStartPW.Text.Trim) > DateTime.Parse(txtEndPW.Text.Trim) Then
   ValidationResult = "Start Date is not less than End Date. Please revise your entry."
End If

Open in new window

0
 
LVL 70

Assisted Solution

by:Éric Moreau
Éric Moreau earned 25 total points
ID: 39171373
why reinvent the wheel. You should use the DateTimePicker control to input dates. When comes time to compare, as already mentioned, you need to compare dates and not text.
0
 
LVL 23

Assisted Solution

by:Ioannis Paraskevopoulos
Ioannis Paraskevopoulos earned 25 total points
ID: 39171387
Add :
Imports System.Globalization

Open in new window

and try this:
MsgBox(DateTime.ParseExact("5/17/2013", "M/d/yyyy", a) > DateTime.ParseExact("1/1/2103", "M/d/yyyy", a))

Open in new window


Giannis
0
 

Author Comment

by:Jimbo99999
ID: 39171398
We actually did consider that. But, after polling the User community they voted on manual entry.  Most of them were former Data-entry people so they are pretty quick on the number keypad.
0
 

Author Closing Comment

by:Jimbo99999
ID: 39171417
Thanks everyone for your responses.  In my spare time I will try out the DateTimePicker control for future reference.
0

Featured Post

Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Introduction As chip makers focus on adding processor cores over increasing clock speed, developers need to utilize the features of modern CPUs.  One of the ways we can do this is by implementing parallel algorithms in our software.   One recent…
1.0 - Introduction Converting Visual Basic 6.0 (VB6) to Visual Basic 2008+ (VB.NET). If ever there was a subject full of murkiness and bad decisions, it is this one!   The first problem seems to be that people considering this task of converting…
In this video, viewers are given an introduction to using the Windows 10 Snipping Tool, how to quickly locate it when it's needed and also how make it always available with a single click of a mouse button, by pinning it to the Desktop Task Bar. Int…
In this video you will find out how to export Office 365 mailboxes using the built in eDiscovery tool. Bear in mind that although this method might be useful in some cases, using PST files as Office 365 backup is troublesome in a long run (more on t…
Suggested Courses

627 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question