Question

C# How get over-crossing of 2 pairs of DateTimes

Asked by: Vladimir_Sukhov

We have date range (just 2 DateTime), we need to know, if this date range is over-crossing next range of 2 date times.

For example, if first 2 Dates are 1 Jan 2009 - 3 Jan 2009, we have to know, is this range is crossing next date 5 Sep 2008 - 4 Mar 2010, or
1 Jan 2009 - 3 Jan 2009 is crossing 2 Jan 2009 - 5 Jan 2009 or
1 Jan 2009 - 7 Jan 2009 is crossing 2 Jan 2009 - 5 Jan 2009 or

How to check this with c#?


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Asked On
2009-09-17 at 01:10:04ID24739008
Topics

Java Native Interface (JNI)

,

Windows ATL / WTL / COM Programming

,

CodeForge

Participating Experts
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Comments
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Answers

 

by: alb66Posted on 2009-09-17 at 01:18:42ID: 25353777

           public bool Test()
            {
                  DateTime dt1 = new DateTime( 2009, 1, 1 );
                  DateTime dt2 = new DateTime( 2009, 3, 1 );

                  DateTime dt3 = new DateTime( 2008, 9, 5 );
                  DateTime dt4 = new DateTime( 2010, 3, 4 );

                  if ( dt1 >= dt3 && dt1 <= dt4 )
                        return true;

                  if ( dt2 >= dt3 && dt2 <= dt4 )
                        return true;

                  return false;
            }

 

by: Vladimir_SukhovPosted on 2009-09-17 at 01:36:40ID: 25353886

This is a variant, but it does not handle all possible cases, for example
dt1 = 1 Jan 2009
dt2 = 7 Jan 2009

dt3 = 3 Jan 2009
dt4 = 5 Jan 2009

here is overclossing, but your code will return false...

 

by: alb66Posted on 2009-09-17 at 01:46:07ID: 25353941

Right!

            public bool Test()
            {
                  DateTime dt1 = new DateTime( 2009, 1, 1 );
                  DateTime dt2 = new DateTime( 2009, 3, 1 );

                  DateTime dt3 = new DateTime( 2008, 9, 5 );
                  DateTime dt4 = new DateTime( 2010, 3, 4 );

                  if ( dt1 >= dt3 && dt1 <= dt4 )
                        return true;

                  if ( dt2 >= dt3 && dt2 <= dt4 )
                        return true;

                  if ( dt1 < dt3 && dt2 > dt4 )       <---- add this check
                        return true;

                  return false;
            }

 

by: Vladimir_SukhovPosted on 2009-09-17 at 01:59:36ID: 25354010

Sure, this is correct decision! Thank alb66!

Just to fully complete this topic, the code need to be modified more. Not always we know that dt1 < dt2 and dt3 < dt4, it could be vice versa, the code will fail again!

Also, initially I had thoughts to do this with just if-then conditions, but maybe there are other ways how to check this per-single-line with maybe some specific c# functions.. What do you think?

 

by: alb66Posted on 2009-09-17 at 02:16:14ID: 25354090

You can write your own class, something like that:

namespace WindowsFormsApplication1
{
	public class DatePeriod
	{
		private DateTime _dt1;
		private DateTime _dt2;
 
		public DatePeriod( DateTime dt1, DateTime dt2 )
		{
			if ( dt1 < dt2 )
			{
				_dt1 = dt1;
				_dt2 = dt2;
			}
			else
			{
				_dt1 = dt2;
				_dt2 = dt1;
			}
		}
 
		public bool Overlap( DatePeriod oOther )
		{
			if ( _dt1 > oOther._dt2 )
				return false;
 
			if ( oOther._dt1 > _dt2 )
				return false;
 
         if ( _dt1 >= oOther._dt1 && _dt1 <= oOther._dt2 )
               return true;
 
         if ( _dt2 >= oOther._dt1 && _dt2 <= oOther._dt2 )
               return true;
 
         if ( _dt1 < oOther._dt1 && _dt2 > oOther._dt2 )
               return true;
 
 
			return true;
		}
	}
 
	public partial class Form1 : Form
	{
		public Form1()
		{
			InitializeComponent();
			Test();
		}
 
		public bool Test()
		{
			DatePeriod oPeriod1 = new DatePeriod( new DateTime( 2009, 1, 1 ), new DateTime( 2009, 3, 1 ) );
			DatePeriod oPeriod2 = new DatePeriod( new DateTime( 2010, 3, 4 ), new DateTime( 2008, 9, 5 ) );
 
			return oPeriod1.Overlap( oPeriod2 );
		}
	}
}
                                              
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by: Vladimir_SukhovPosted on 2009-09-17 at 04:44:42ID: 25354917

Yes alb66, thanks you very much!!

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