CODEWITHSUNDEEP
c#datec#-4.0datetimeaddition
Nomi Ali
Nomi Ali

Reputation: 2262

Datetime in C# add days

I want to add days in some date. I have a code like this: 

DateTime endDate = Convert.ToDateTime(this.txtStartDate.Text); 
Int64 addedDays = Convert.ToInt64(txtDaysSupp.Text); 
endDate.AddDays(addedDays); 
DateTime end = endDate; 
this.txtEndDate.Text = end.ToShortDateString();

But this code is not working, days are not added! What the stupid mistake I'm doing?

Upvotes: 92

Views: 300008

Answers (7)

user8537597
user8537597

Reputation:

Use this:

DateTime dateTime =  DateTime.Now;
DateTime? newDateTime = null;
TimeSpan numberOfDays = new TimeSpan(2, 0, 0, 0, 0);
newDateTime = dateTime.Add(numberOfDays);

Upvotes: 5

Nayas Subramanian
Nayas Subramanian

Reputation: 2379

You can add days to a date like this:

// add days to current **DateTime**
var addedDateTime = DateTime.Now.AddDays(10);

// add days to current **Date**
var addedDate = DateTime.Now.Date.AddDays(10);

// add days to any DateTime variable
var addedDateTime = anyDate.AddDay(10);

Upvotes: 12

coder
coder

Reputation: 2000

Assign the enddate to some date variable because AddDays method returns new Datetime as the result..

Datetime somedate=endDate.AddDays(2);

Upvotes: 7

Freeman
Freeman

Reputation: 5801

Its because the AddDays() method returns a new DateTime, that you are not assigning or using anywhere.

Example of use:

DateTime newDate = endDate.AddDays(2);

Upvotes: 12

Steve
Steve

Reputation: 3061

DateTime is immutable. That means you cannot change it's state and have to assign the result of an operation to a variable.

endDate = endDate.AddDays(addedDays);

Upvotes: 155

bash.d
bash.d

Reputation: 13217

Why do you use Int64? AddDays demands a double-value to be added. Then you'll need to use the return-value of AddDays. See here.

Upvotes: 4

Jensen
Jensen

Reputation: 3538

You need to catch the return value.

The DateTime.AddDays method returns an object who's value is the sum of the date and time of the instance and the added value.

endDate = endDate.AddDays(addedDays);

Upvotes: 22

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