Problem summing dates in C# .NET

Question

3.00/5 (1 vote)

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Hello everyone

I have this problem

I need sum the day + 1 and I don't know how to do that.

The result should be:

Day + 1/Month/Year

Thanks

Posted 18-Feb-11 6:53am

TANicox

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3 solutions

Solution 3

More generally, you can add/subtract System.TimeSpan to cover any thinkable periods of time.

C#

DateTime before = DateTime.Now;
//wait a bit
DateTime after = DateTime.Now;

TimeSpan duration = after - before;
TimeSpan extraTime = new TimeSpan(2, 12, 21); //2:12:21 hours:minutes:seconds

duration += extraTime; //defined add/subtract for TimeSpan

before += duration; //defined add/subtract for DateTime and TimeSpan (must be right operand)
before = before - duration;

//will not compile, not defined, of course:
//duration = duration - after;

—SA

Posted 18-Feb-11 7:11am

Sergey Alexandrovich Kryukov

Comments

Espen Harlinn 18-Feb-11 13:59pm

Good instructions, a 5 :)

Sergey Alexandrovich Kryukov 18-Feb-11 14:18pm

Thank you.
--SA

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Nish Nishant · Accepted Answer · 2011-02-18T06:57:00

Solution 1

C#

DateTime today = DateTime.Now.Date;
DateTime tomorrow = today.AddDays(1);

Posted 18-Feb-11 6:57am

Nish Nishant

Updated 18-Feb-11 6:58am

v3

Comments

TANicox 18-Feb-11 13:01pm

Ok,
I had already tried but the problem with this is:
I don't want to show me the time.

Sergey Alexandrovich Kryukov 18-Feb-11 13:12pm

Right, 5, but see my more general Answer.
--SA

Espen Harlinn 18-Feb-11 14:01pm

Good answer - he asked about how to add one day to a datetime - My 5

Nish Nishant 18-Feb-11 14:09pm

Thanks Espen.

Henry Minute · Accepted Answer · 2011-02-18T06:58:00

Solution 2

C#

DateTime myDateTime = DateTime.Now;
DateTime newDateTime = myDateTime.AddDays(1);

If only you had read the documentation[^] you might have found such an elementary thing for yourself.

Posted 18-Feb-11 6:58am

Henry Minute

Comments

TANicox 18-Feb-11 13:02pm

Ok, I had already tried but the problem with this is: I don't want to show me the time.

Henry Minute 18-Feb-11 13:07pm

There is no separate Date structure/class in .NET. If it is a matter of displaying just the Date part then use the newDate.ToShortDate() or newDate.ToLongDate() methods which both return a string of just the date part.

If there is a different problem, then please edit your question to try to describe it.

Sergey Alexandrovich Kryukov 18-Feb-11 13:15pm

The name "DateTime" for methods and properties is very common and pretty silly.
There is no such thing as "date" in nature, essentially "date" is also time.
So conceptually "DateTime" is just "Time", but the class encapsulate methods of working with calendar, similar thing is with TimeSpan.
--SA

Henry Minute 18-Feb-11 13:17pm

At least it is fairly descriptive of what it does. Not always true of .NET classes.

TANicox 18-Feb-11 13:10pm

The problem is this:

MessageBox.Show(DateTime.Now.AddDays(1).ToString());

Result:
19/02/2011 17:09
I don't want the time

Henry Minute 18-Feb-11 13:12pm

Then as in my previous reply use either .ToShortDate() or .ToLongDate() instead of ToString().

Sergey Alexandrovich Kryukov 18-Feb-11 13:17pm

Generally, you should properly format date/time, see help on string.Format and further references. This is also culture-depended, so you can use current thread culture or specify the culture you want.
--SA

Henry Minute 18-Feb-11 13:22pm

That is true, but I made a judgment call on the OPs apparent level and decided on the easier of two possibilities.

Sergey Alexandrovich Kryukov 18-Feb-11 14:20pm

You sure, it's cool, so I already voted 5.
My answer is just the generalization, as I say, though it's useful.
Thank you.
--SA

Sergey Alexandrovich Kryukov 18-Feb-11 13:12pm

Right, 5, but see my more general Answer.
--SA

TANicox 18-Feb-11 13:17pm

Oh, thanks... This is silly but today I don't I get nothing

Orcun Iyigun 18-Feb-11 13:28pm

MessageBox.Show(DateTime.Now.AddDays(1).ToString("d"));

Henry Minute 18-Feb-11 13:35pm

That works too, as do the slightly more 'complex' variants. The "dd/MMM/yyyy" varieties.

Espen Harlinn 18-Feb-11 14:02pm

Good effort, my 5