SQL Server Date Column Format

Sql server date Column format

its default setting is yyyy-MM-dd

No, it's not. There is no formatting information at all associated with the field.

The value is not formatted by the database, it's returned only as a point in time. Formatting that value into it's textual representation is done by the applcation that is getting the data from the database.

So, there is nothing that you can do in the database to change how the date value is formatted, you have to change that where the data is displayed.

SQL: how to specify a date format on creating a table and fill it

You don't need to specify the format in the table definition as dates are stored in a binary format.

CREATE TABLE APP(
    ID   INT NOT NULL,
    DT DATE,
    ADDRESS  NVARCHAR (100) ,
    PRIMARY KEY (ID)
);

When you try to insert into that table however, the server will try to convert the string to a date before inserting it. This can be problematic as it is unable to tell if 12.11.2017 is the 12th of November or 11th of December. To figure this out it uses the localization settings of the user account that is performing the operation.

Often you will find that the account that is running the operation is set to USA format, month day then year (MDY), when what you want is day month year (DMY) format. One way to tell it what the sequence of the date's parts is to use the DATEFORMAT setting like this:

SET DATEFORMAT dmy;

INSERT INTO APP (ID, DT)
VALUES (1,'22.12.2016')

Another alternative is to cast the string to a date using the CONVERT function and tell it what the date format is. The formats have numeric codes like 104 for German format Like this:

INSERT INTO APP (ID, DT)
VALUES (2,CONVERT(date,'22.12.2016',104))

How to change format date column in SQL Server?

String manipulations to get it into a yyyy-mm-dd format are similar:

CAST(
    RIGHT(t.[Date],4) +
    '-' +
    LEFT(RIGHT(t.[Date],4),2) +
    '-' +
    LEFT(t.[Date],2)
AS DATETIME)

Here, I assume your table name is t and your date column is Date.

Change the format of date column

You can simply do this:

select CONVERT(varchar(10), purchaseDate, 120) AS 'Purchase Date'
from purchaseOrders
where purchaseDate
between '20-09-18' and '20-10-18';

More here: How to get a date in YYYY-MM-DD format from a TSQL datetime field?

Edit 2:

SQLite requires date to be in YYYY-mm-dd format or other recognizable formats in this post:
SQL Select between dates

You can simply do this:

select *
from purchaseOrders
where purchaseDate
between '2018-09-18' and '2018-10-18'

Creating a date column with date format in SQL

There are two different things at play:

1. The format a date is stored in the database
2. The format a date is displayed with

It is easy to confuse these two, and even more when using SQLite.

However, storing a date in the database as a text is not a good idea. This will mean the database can store invalid dates, such as "ABC", but also "2015-13-01" and "2015-02-29".

Also, databases work faster with numeric representations of dates than strings of 10 characters. With numeric representations you can more easily do date calculations, like for instance adding a day to a date (+1), while with string representations that would be more complex.

Here is a suggestion:

1. Date storage type

Create your table like this:

CREATE TABLE patient(
    dateregistered int not null
);

and insert values like this:

2. Inserting dates

insert into patient values (julianday('2015-12-31'));

With this set up, invalid dates will either be turned into valid dates or rejected. For instance:

julianday('2015-02-29')

will result in 2015-03-01 being stored in the table. And this:

julianday('2015-13-20')

will turn into a NULL value, triggering an error on insert.

It actually becomes impossible to insert something that is not a valid date.

3. Querying dates

You would get dates in readable format like this:

select date(dateregistered)
from   patient

The date function takes care of the formatting to YYYY-MM-DD.

But you can also do calculations, like adding one day:

select date(dateregistered+1)
from   patient

Or, if you have also another date, like dateinvited, you can easily get the number of days between these two events:

select dateinvited - dateregistered
from   patient

4. Optional: create a view

If you find it cumbersome to specify date(...) whenever you want to query a date in YYYY-MM-DD format, then create a view that does this for you:

create view vw_patient as
select date(dateregistered) dateregistered
from   patient

And now when you select from that view:

select dateregistered
from   vw_patient

You'll get a string:

2015-02-28

How to change datetime format in query?

This is what finally worked:
I Casted the datetime and used FORMAT() with a custom format. The other solutions I tried where a little bit slower.

WHERE s.zeitpunkt
  BETWEEN 
    CAST( 
        FORMAT(CAST($__timeFrom() AS DATETIME),'yyyyMMddHHmmss')
      AS VARCHAR)
    AND CAST(
        FORMAT(CAST($__timeTo() AS DATETIME),'yyyyMMddHHmmss')
      AS VARCHAR)

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