Reputation: 2262
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
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
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
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
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
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
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
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