How do you write code to compare date in C#?

Nagesh1

Java code look like this.

 public static void main( String[] args ) 
    {
    	try{
		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
    	Date date1 = sdf.parse("2009-12-31");
    	Date date2 = sdf.parse("2010-01-31");

    	System.out.println(sdf.format(date1));
    	System.out.println(sdf.format(date2));

    	if(date1.after(date2)){
    		System.out.println("Date1 is after Date2");
    	}

    	if(date1.before(date2)){
    		System.out.println("Date1 is before Date2");
    	}

    	if(date1.equals(date2)){
    		System.out.println("Date1 is equal Date2");
    	}

	}catch(ParseException ex){
		ex.printStackTrace();
	}

C# code is looking like this

DateTime date1  = new DateTime(2009,12,31);
DateTime date2  = new DateTime(2010,01,31);
if (date1 < date2)

{

Console.WriteLine("Date2 greater " + date2.Date);

}

else if (date1 > date2)

{

Console.WriteLine("Date1 higher! " + date1.Date);

}

else

{

Console.WriteLine("Equal Dates");

}

Both code working fine, but is there better way to compare date in C#?

mrsparkyman

DateTime date1  = new DateTime(2009,12,31);
DateTime date2  = new DateTime(2010,01,31);
if (date1 > date2)

{

Console.WriteLine("Date1 higher! " + date1.Date);

}

else

{

if ( date1 < date2)

{

Console.WriteLine("Date2 higher! " + date2.Date);

}

else

{

Console.WriteLine("Equal Dates");

}

}

Just to be accurate in the feedback to the user.

I don't know much
about C# or the use of this snippet so don't take my word as Divine
Truth, it's just a nudge in the right direction.

Cassidy

I'm no C# coder, but I would imagine - just like Java - there's some comparator that does the job for you.

Sutherlands

<, >, ==, would be the preferred ways to compare dates.

Nagesh1

@Cassidy said:

I'm no C# coder, but I would imagine - just like Java - there's some comparator that does the job for you.

That look much better

Thx.

Sutherlands

@Nagesh said:

@Cassidy said:
I'm no C# coder, but I would imagine - just like Java - there's some comparator that does the job for you.

That look much better
Thx.

Yes, because

int compareValue = date1.CompareTo(date2)

if(compareValue > 0) {}

else if(compareValue < 0) {}

else {}

is much easier to read than

if(date1 > date2) {}

else if(date1 < date2) {}

else {}

*roll*

Nagesh1

Your sarcasm like behaviour is not bother me at all.

Cassidy

All your sarcasm is not bother to you?

Sutherlands

All your sarcasm, sarcasm, sarcasm.... All your sarcasm, is not bother to me.

ekolis

You have no chance to repent! Make your time!

You could use Compare API of datetime object to get this done.

DateTime date1 = DateTime.parse("2011-03-01")

DateTime date2 = DateTime.parse("2012-03-01")

int result = DateTime.Compare(date1, date2);

if (result < 0)
 Console.writeLine("date1 is earlier than date2)";
 else if (result == 0)
 Console.writeLine("date1 is equal to date2)";
 else
 Console.writeLine("date1 is later than date2)";

if you want to parse in various date formats or if you want more detailed explanation you could go to http://technico.qnownow.com/2012/03/20/how-to-compare-dates-in-c/

Sutherlands

@veeraC85 said:

You could use Compare API of datetime object to get this done.
DateTime date1 = DateTime.parse("2011-03-01")
DateTime date2 = DateTime.parse("2012-03-01")
int result = DateTime.Compare(date1, date2);
if (result < 0)
 Console.writeLine("date1 is earlier than date2)";
 else if (result == 0)
 Console.writeLine("date1 is equal to date2)";
 else
 Console.writeLine("date1 is later than date2)";

Did you create an account JUST to post something that's already been posted in the thread? That's not even spambot, that's... just... i don't know.

lisawinkler

In the my opinion, there are some suitable way to compare the data in the C#. Some are defined here

1- To compare the data with each other ,we use the '==' and 'equals' method

2- To compare the data type of the variable of the each other we use the '===' .

etc.

I hope that if you finds any problem in your c# code then you can mail me at "passcertification@ymail.com" . I am waiting you action.

Thanking you.

dhromed

The funniest thing is that "passcertification@ymail.com" will probably start receiving tons of spam.

ekolis

@lisawinkler said:

2- To compare the data type of the variable of the each other we use the '===' .

Umm, C# doesn't have a === operator... you thinking of Javascript?

Cassidy

@ekolis said:

you thinking of Javascript?

I'm thinking "do not feed the bots"...

lyndaeldo

@Nagesh said:

Java code look like this.

 public static void main( String[ args ) 
    {
    	try{
 
    		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        	Date date1 = sdf.parse("2009-12-31");
        	Date date2 = sdf.parse("2010-01-31");
 
        	System.out.println(sdf.format(date1));
        	System.out.println(sdf.format(date2));
 
        	if(date1.after(date2)){
        		System.out.println("Date1 is after Date2");
        	}
 
        	if(date1.before(date2)){
        		System.out.println("Date1 is before Date2");
        	}
 
        	if(date1.equals(date2)){
        		System.out.println("Date1 is equal Date2");
        	}
 
    	}catch(ParseException ex){
    		ex.printStackTrace();
    	}

C# code is looking like this

DateTime date1  = new DateTime(2009,12,31);
DateTime date2  = new DateTime(2010,01,31);
if (date1  date2)

{

Console.WriteLine("Date1 higher! " + date1.Date);

}

else

{

Console.WriteLine("Equal Dates");

}

Both code working fine, but is there better way to compare date in C#?

Simple way you can do this

TimeSpan diff = date2.Subtract(date1);

more info :

http://csharp.net-informations.com/statements/csharp-date-difference.htm

eldo.

Cassidy

@Nagesh said:

if(date1.equals(date2)){ System.out.println("Date1 is equal Date2"); }

Given you've tested for greater and less... is there any point in performing a third test?

Nagesh1

@Cassidy said:

@Nagesh said:
if(date1.equals(date2)){
System.out.println("Date1 is equal Date2");
}

Given you've tested for greater and less... is there any point in performing a third test?

Above example for illustrating purpose only. What you're are saying is it is necessary to write water-tight code.

Cassidy

@Nagesh said:

What you're are saying is it is necessary to write water-tight code.

No, I'm saying it's pointless testing for a situation that must hold true in order to reach that part of the code.