Check Date is tomorrow in C#.net

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1.11/5 (3 votes)

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Hi all

I write some code to check that now date is tomorrow :

C#

string re_dat = string.Empty;
       re_dat = SDKClass.Selct_Date_now(); // return today date from database

     bool date_now = DateTime.Parse(re_dat).AddDays(1);

      if(date_now)
      {
          Response.Write("tomorrow");
      }

but i have following error :
Cannot implicitly convert type 'DateTime' to 'bool'

Thanks a lot.

Posted 11-Jun-15 23:35pm

bernova

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OriginalGriff · Answer 1 · 2015-06-11T23:59:00

Solution 1

C#

DateTime toCheck = DateTime.Parse(re_dat).Date;
if (DateTime.Now.AddDays(1).Date == toCheck)
   {
   ...
   }

Posted 11-Jun-15 23:59pm

OriginalGriff

Comments

bernova 12-Jun-15 8:24am

Thanks for your response.
But you say that if DateTime.Now.AddDays(1).Date equal to date that return from database , so today is tomorrow ?!!!

OriginalGriff 12-Jun-15 8:32am

DateTime.Now - this exact moment.
(This exact moment).AddDays(1) - this exact time but tomorrow
(this exact time but tomorrow).Date - Midnight, start of tomorrow (strips off the time element)

So
if (DateTime.Now.AddDays(1).Date == toCheck)
matches if and only if toCheck is also midnight, start of tomorrow.

bernova 12-Jun-15 16:02pm

thanks , but this condition don't fire.

if (DateTime.Now.AddDays(1) == date_now)
{
SDKClass.Update_date(DateTime.Now.ToShortDateString());
int re_t = Convert.ToInt32(select_today_view);
int re_yes = Convert.ToInt32(select_yesterday_View);
int re_s = re_t + re_yes;
SDKClass.Update_yesterday_View(Convert.ToString(re_s));

SDKClass.Update_today_View("1");
}

OriginalGriff 12-Jun-15 16:18pm

Now compare what you have as code to what I had as code, and the description I typed seven hours ago... :sigh:

bernova 12-Jun-15 16:46pm

sorry My internet connection has been lost.

bernova 12-Jun-15 16:51pm

date_now value in date base is last date and in the condition , we check
if ( tomorrow(DateTime.Now.AddDays(1)) == yesterday(date_now) ) , so this condition don't fire.

OriginalGriff 12-Jun-15 17:06pm

And what did I put on the end of each side that you didn't?
:laugh:

bernova 12-Jun-15 17:10pm

I don't understand your purpose.
this condition don't fire...

OriginalGriff 13-Jun-15 4:36am

If you want to compare two DateTime values for equality, they must be exactly the same: just as 123==124 will fail, but 123==123 will pass.
DateTime values are accurate to a microsecond: so if you want to compare two DateTime values, you need to ensure that they are accurate to the microsecond.
When you use DateTime.Now, it returns the current Date and Time - accurate to the microsecond. Adding a day to that leaves the time part untouched and increments the day only.

Now look at what I wrote above.
See the ".Date" part I added?
That removes the time information and makes it the start of the day.
So if you want to compare two DateTime elements for "same day" you need to ignore the Time portion - using .Date on both sides of the == ensures that they both have the same Time portion.

bernova 13-Jun-15 8:29am

thanks for your very good response , Now I change the code:

re_dat = SDKClass.Selct_Date_now(); // select date from database field
DateTime date_now = DateTime.Parse(re_dat).Date;

if (date_now.Date == DateTime.Now.AddDays(1).Date)
{
SDKClass.Update_date(DateTime.Now.ToShortDateString());
int re_t = Convert.ToInt32(select_today_view);
int re_yes = Convert.ToInt32(select_yesterday_View);
int re_s = re_t + re_yes;
SDKClass.Update_yesterday_View(Convert.ToString(re_s));
}

but in the database , the value of date_now is 2015/06/13(yesterday) and we compare this with the (DateTime.Now.AddDays(1).Date) that is mean today date
and our condition don't fire, I do this but don't run.

thanks

OriginalGriff 13-Jun-15 8:34am

Um...have you looked at a calendar lately?
Or even at the time / date combo in the bottom right of your PC screen?
What's the date today? I do know where Iran is, and Wales, and I do know there are on the same side of the IDL...

bernova 13-Jun-15 9:07am

....
just and just I going to check if ( date(today) += 1) , that is tomorrow , my function does fire. but I can't get the tomorrow.

OriginalGriff 13-Jun-15 10:23am

Please, stop guessing and start thinking!

You have all the bits, and you see to just be throwing them together and hoping it will work. That isn't a viable strategy for anything other than trivial tasks!

bernova 13-Jun-15 11:30am

algorithm is true but the problem is Syntactic error not logical.

OriginalGriff 13-Jun-15 11:45am

So look at the error message, and look at the line it's reporting it on.
Sometimes, the error is on the line above - but normally it's on the actual line. I can't fix Syntax errors I can't see (and it's a lot quicker to learn to fix them yourself - you are going to get a lot of them, we all do!)

Bimal pedini · Answer 2 · 2015-06-12T00:15:00

Solution 2

Hi

C#

var yourDate = DateTime.Now; // provide your date;
           if (yourDate == DateTime.Now.AddDays(1))
           {
              // this is tomarrow
           }

Thanks
Bimal

Posted 12-Jun-15 0:15am

Bimal pedini