add 7 days adds 6 days why

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C#

int year = DateTime.Now.Year;
                  int month = DateTime.Now.Month;
                  int days = DateTime.Now.Day;

                  DateTime StartDate = new DateTime(year,month,days);
                  DateTime EndDate = StartDate.AddDays(7);

i am adding 7 days to datetime now.
its gets when debbuging from 03-24 until 03-31 but it should be 04-01?

why?

Posted 23-Mar-15 23:04pm

Kurac1

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BillWoodruff 24-Mar-15 5:12am

You are starting at the beginning of Day 24 (12 AM), and going until the beginning of Day 31 (12 AM). Count the days.

3 solutions

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User 11457577 · Answer 1 · 2015-03-23T23:08:00

Solution 1

if you look at the calendar, next week tuesday is 31 march. not 1st of april.

Posted 23-Mar-15 23:08pm

User 11457577

Kornfeld Eliyahu Peter · Answer 2 · 2015-03-23T23:09:00

Solution 2

You missed something here...
First! Why re-create Now instead of using it....

C#

DateTime StartDate = DateTime.Now;

Second! Let count together...

24 + 1 = 25
25 + 1 = 26
26 + 1 = 27
27 + 1 = 28
28 + 1 = 29
29 + 1 = 30
30 + 1 = 31

Now that's exactly! 7 lines!!!

Posted 23-Mar-15 23:09pm

Kornfeld Eliyahu Peter

OriginalGriff · Answer 3 · 2015-03-23T23:09:00

Solution 3

Um.

M   T   W   Th  Fr  Sa  Su
23  24  25  26  27  28  29
30  31  01  02  03  04  05

24th plus 7 days == Tuesday 31st March...

Posted 23-Mar-15 23:09pm

OriginalGriff

Comments

Kurac1 24-Mar-15 5:12am

yes but i want i to be from 24 to 1 april always 7 days

Kornfeld Eliyahu Peter 24-Mar-15 5:16am

There is 7 days in-between the 1st of April and the 24th of March - it's true, but AddDays - of any system I know of - works in an other way...
You get the 7th day from the base day and not a gap of 7 days...If you want to get a gap of 7 days you have to add 8 days...But this is a special requirement and AddDays works just perfectly...

Kurac1 24-Mar-15 5:18am

Alright because right now i add 7 days and it displays 6 days only

Kurac1 24-Mar-15 5:37am

adding(8) still displays 6 days? why?
Yesterday i tried to add 8 days that it showed 7 days but today its tuesday and adding 8 days display 6 days still

OriginalGriff 24-Mar-15 5:52am

Well...when I try your code, it works fine for me:
int year = DateTime.Now.Year;
int month = DateTime.Now.Month;
int days = DateTime.Now.Day;

DateTime StartDate = new DateTime(year, month, days);
DateTime EndDate = StartDate.AddDays(7);
DateTime Enddate2 = StartDate.AddDays(8);

I get 31/03/2015 and 01/04/2015. So what are we doing that is different?

BTW: Don't do it like that - that is a good source of very annoying and hard to find bugs! Think about it: what happens if the clock goes over midnight while executing that code?

Do this instead:

DateTime StartDate = DateTime.Now.Date;

It has the same effect, but it doesn't risk date rollover bugs.

Kornfeld Eliyahu Peter 24-Mar-15 5:52am

It is confusing...
Where and how you see 6 days after adding 8 days?