Solved

compare two dates

Posted on 2010-09-07
10
626 Views
Last Modified: 2012-05-10
I have 4 date values :
 
first 2
begindate1 and enddate1

second 2
begindate2 and enddate2

i am going to compare begindate2 and enddate2 with begindate1 and enddate1 and the second set of dates cannot fall between first set of dates.

here is an example of what i want

begindate1 = 7/1/2010
enddate1 = 7/31/2010

if begindate2 = 6/1/2010
end date 2 = 6/30/2010 then true

if begindate2 = 8/1/2010
end date 2 = 8/30/2010 then true

if begindate2 = 7/10/2010
end date 2 = 7/20/2010 then false

how do i do this check.
0
Comment
Question by:pratikshahse
  • 2
  • 2
  • 2
  • +4
10 Comments
 
LVL 2

Expert Comment

by:gmilhon
Comment Utility
Just check both values with one if statement...

if (begindate2 > begindate1) and (enddate2 < enddate1) {
    // True code here
} else {
    // False code here
}
0
 
LVL 29

Expert Comment

by:anarki_jimbel
Comment Utility
I believe the following check would be sufficient:
        private void button1_Click(object sender, EventArgs e)

        {

            DateTime begindate1 = new DateTime(2010, 07, 01);

            DateTime enddate1 = new DateTime(2010, 07, 31);

            DateTime begindate2 = new DateTime(2010, 07, 10);

            DateTime enddate2 = new DateTime(2010, 07, 20);

            bool notOverlap = checkNotOverlapping(begindate1, enddate1, begindate2, enddate2);

            MessageBox.Show("result = " + notOverlap.ToString());

        }



        private bool checkNotOverlapping(DateTime begindate1, DateTime enddate1, DateTime begindate2, DateTime enddate2)

        {

            bool notOverlap = true;

            // argument checking:

            if((begindate1>enddate1) || (begindate2>enddate2))

            {

                throw new ArgumentException("Start date cannot be greater than end date");

            }



            if (!((begindate1 > enddate2) || begindate2 > enddate1))

            {

                notOverlap = false;

            }

            return notOverlap;

        }

Open in new window

0
 
LVL 29

Expert Comment

by:anarki_jimbel
Comment Utility
Really above I check if the second period starts AFTYER the first one , or vice versa. If we need to check the second one falls INTO the first one (or vice versa) - it will be a different check, something like like gmilhon showed.
0
 
LVL 8

Expert Comment

by:Mikkk
Comment Utility

if begindate1 < begindate2 then
  if enddate1 < begindate2 then
    'not overlapped
  else
    'overlapped
  end if
else
  if enddate2 < begindate1 then
    'not overlapped
  else
    'overlapped
  end if
end if

Open in new window

0
 
LVL 14

Expert Comment

by:sentner
Comment Utility
If you only care if the second date pair is fully encompased in the first range, and not just overlapping, then gmilhon's solution should work.

However, if you need to see if they overlap at all, you need something like:

if (begindate2 >= begindate1) and (begindate2 <= enddate1)
  or (enddate2 >= begindate1) and (enddate2 <= enddate1)
  or (begindate1 >= begindate2) and (begindate1 <= enddate2)
  or (enddate1 >= begindate2) and (enddate1 <= enddate2)  {
    // True code here
} else {
    // False code here
}
0
What Should I Do With This Threat Intelligence?

Are you wondering if you actually need threat intelligence? The answer is yes. We explain the basics for creating useful threat intelligence.

 
LVL 7

Accepted Solution

by:
illusio earned 500 total points
Comment Utility
geez what an if constructions...

if you are sure that the begindates are smaller then the enddates:
return  (edt2 < bdt1 || edt1 < bdt2);

if you aren't sure about that:
return (bdt1<edt1 && bdt2<edt2) && (edt2 < bdt1 || edt1 < bdt2);

Peter
0
 
LVL 2

Expert Comment

by:stagep
Comment Utility
We need to know what you mean exactly by "the second set of dates cannot fall between first set of dates". Based on your example, what is the result for 6/15 to 7/15? true or false?
0
 

Author Comment

by:pratikshahse
Comment Utility
stagep

the scenario that you are talking about in that case

if dates are (6/15 to 7/15)  (one of the dates falls in between the first date range)
{
message "overlapping dates found";
}
else
{
valid dates.
}
0
 

Author Comment

by:pratikshahse
Comment Utility
stagep

if the dates are 7/15 - 8/15
{
message "overlapping dates found";
}
else
{
valid dates.

}
0
 
LVL 2

Expert Comment

by:stagep
Comment Utility
then illusio has the correct answer as the second range of dates must either end before the first date range starts, or start after the the first date range ends.
0

Featured Post

How to run any project with ease

Manage projects of all sizes how you want. Great for personal to-do lists, project milestones, team priorities and launch plans.
- Combine task lists, docs, spreadsheets, and chat in one
- View and edit from mobile/offline
- Cut down on emails

Join & Write a Comment

ASP.Net to Oracle Connectivity Recently I had to develop an ASP.NET application connecting to an Oracle database.As I am doing it first time ,I had to solve several problems. This article will help to such developers  to develop an ASP.NET client…
Exception Handling is in the core of any application that is able to dignify its name. In this article, I'll guide you through the process of writing a DRY (Don't Repeat Yourself) Exception Handling mechanism, using Aspect Oriented Programming.
Internet Business Fax to Email Made Easy - With eFax Corporate (http://www.enterprise.efax.com), you'll receive a dedicated online fax number, which is used the same way as a typical analog fax number. You'll receive secure faxes in your email, fr…
Polish reports in Access so they look terrific. Take yourself to another level. Equations, Back Color, Alternate Back Color. Write easy VBA Code. Tighten space to use less pages. Launch report from a menu, considering criteria only when it is filled…

743 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

Need Help in Real-Time?

Connect with top rated Experts

15 Experts available now in Live!

Get 1:1 Help Now