how to make a substraction between a datetime and integer?

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Hallo Guy please i need your help.

I want to calculate a difference between a date and a duration like this.

C#

DateTime date_Of_End = new DateTime(2012, 6, 02);
int duration  = 30;

DateTime date_Of_Bigin = date_Of_End - duration ;

Please i get a failure how can i do? have somebody an idea??

Posted 2-Jun-12 4:20am

stefan from germany

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3 solutions

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Linto Leo Tom · Accepted Answer · 2012-06-02T04:39:00

Solution 1

Hi,

You can try this.

To Add :- date_Of_End .AddDays(30)

To Subtract :- date_Of_End .Subtract(30)

Happy Coding
:)

Posted 2-Jun-12 4:39am

Linto Leo Tom

Comments

Umer Aziz Malik 2-Jun-12 11:24am

Good answer Linto. Spot on :) +5

Linto Leo Tom 2-Jun-12 12:03pm

Thanx Umer... :)

Prasad_Kulkarni 3-Jun-12 1:32am

Good one +5!

VJ Reddy · Accepted Answer · 2012-06-02T05:06:00

Solution 2

If it is required to deduct 30 days from the Date, then I think the AddDays method of DateTime class with negative number can be used as the Substract method of DateTime accepts a DateTime object and not a duration.

C#

DateTime date_Of_End = new DateTime(2012, 6, 02);
DateTime date_Of_Bigin = date_Of_End.AddDays(-30);
Console.WriteLine (date_Of_Bigin.ToString("dd/MM/yyyy",
	System.Globalization.CultureInfo.InvariantCulture));
//Output
//03/05/2012

Posted 2-Jun-12 5:06am

VJ Reddy

Comments

Umer Aziz Malik 2-Jun-12 11:24am

A much detailed and robust solution. +5

VJ Reddy 2-Jun-12 11:51am

Thank you, Umer :)

Linto Leo Tom 2-Jun-12 11:38am

You are absolutely right VJ...

VJ Reddy 2-Jun-12 11:51am

Thank you, Linto :)

Manas Bhardwaj 2-Jun-12 11:45am

nice. +5.

VJ Reddy 2-Jun-12 11:51am

Thank you, Manas :)

Prasad_Kulkarni 3-Jun-12 1:32am

5'ed

VJ Reddy 3-Jun-12 2:29am

Thank you, Prasad :)

Manas Bhardwaj · Accepted Answer · 2012-06-02T05:46:00

Solution 3

Adding to what VJ Reddy explained, I usually prefer to use TimeSpan[^]. It gives you flexibility when you want to have more accurate calculations. For eg. 30 days, 10 hours and 45 mins :)

C#

DateTime date_Of_End = new DateTime(2012, 6, 02);

int duration  = 30;

TimeSpan tsDay = newTimeSpan(duration, 0, 0, 0);
 
DateTime date_Of_Bigin =  date_Of_End.Subtract(tsDay);

Posted 2-Jun-12 5:46am

Manas Bhardwaj

Comments

Linto Leo Tom 2-Jun-12 11:49am

You spiced it with more pepper and garlic... Good one. :) +5

Manas Bhardwaj 2-Jun-12 11:53am

Thanx!

VJ Reddy 2-Jun-12 11:51am

Good answer. 5!

Manas Bhardwaj 2-Jun-12 11:53am

Thanx!

Prasad_Kulkarni 3-Jun-12 1:33am

5'ed

Manas Bhardwaj 3-Jun-12 11:11am

thanks!