Subtract days from a DateTime

Question

I have the following code in my C# program.

DateTime dateForButton =  DateTime.Now;  
dateForButton = dateForButton.AddDays(-1);  // ERROR: un-representable Date         


        

Answer 1

The dateTime.AddDays(-1) does not subtract that one day from the dateTime reference. It will return a new instance, with that one day subtracted from the original reference.

DateTime dateTime = DateTime.Now;
DateTime otherDateTime = dateTime.AddDays(-1);

Answer 2

You can do:

DateTime.Today.AddDays(-1)

Answer 3

I've had issues using AddDays(-1).

My solution is TimeSpan.

DateTime.Now - TimeSpan.FromDays(1);

Answer 4

DateTime dateForButton = DateTime.Now.AddDays(-1);

Answer 5

Using AddDays(-1) worked for me until I tried to cross months. When I tried to subtract 2 days from 2017-01-01 the result was 2016-00-30. It could not handle the month change correctly (though the year seemed to be fine).

I used date = Convert.ToDateTime(date).Subtract(TimeSpan.FromDays(2)).ToString("yyyy-mm-dd"); and have no issues.

Answer 6

You can use the following code:

dateForButton = dateForButton.Subtract(TimeSpan.FromDays(1));