changing culture does not change date time Format.

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entered date is 2015-01-30

C#

System.Globalization.CultureInfo en = new System.Globalization.CultureInfo("en-US");
     System.Threading.Thread.CurrentThread.CurrentCulture = en;
     DateTime dt =Convert.ToDateTime(txbuyerOrder_date.Text, en.DateTimeFormat);

CSS

dt is always {30/01/2015 12:00:00 AM}

whether culture is en-GB or en-US or anything else

Posted 29-Jan-15 22:56pm

varun150

Updated 29-Jan-15 22:57pm

v2

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OriginalGriff · Accepted Answer · 2015-01-29T23:07:00

Solution 1

A DateTime doesn't have a format - it is stored as a number of milliseconds since an arbitrary point in time, so all it has is a number!

It only acquires a format when it is prepared for presentation to a user bymenas of the ToString method, either explicitly via a call:

C#

string myDate = dt.ToString();

Or implicitly:

C#

Console.WriteLine(dt);

Or

C#

string myDate = "The date is " + dt;

When the conversion to a string is done, the culture in effect on the PC doing the conversion controls how the resulting string is formatted.

[edit]
You can override the default formatting by specifying the exact output format you want - see here: Formatting a DateTime for display - format string description[^]
[/edit]

Posted 29-Jan-15 23:07pm

OriginalGriff

Updated 29-Jan-15 23:09pm

v2

Comments

varun150 30-Jan-15 5:19am

string date32 = dt.ToString("yyyy-MM-dd");

it worked thanks.

OriginalGriff 30-Jan-15 5:23am

You're welcome!

OriginalGriff 30-Jan-15 5:57am

Silly question: why are you using ISO format dates?
You aren't going to use the string to pass a date to a database, are you?

varun150 31-Jan-15 4:35am

yes yes i pass it to database. please tell me if there is something more to this.

OriginalGriff 31-Jan-15 4:50am

There is more to this.
If you are converting the DateTime to a string to pass to a DB, then you are making two mistakes:
Firstly, you are converting it unnecessarily - you can pass a DateTime value from C# to a DB without any conversion and it will work.
Secondly, it implies that you are concatenating strings to form an SQL command, and that is very, very dangerous - it leaves you wide open to something called SQL Injection, where the user can take full control of your database, and accidentally or deliberately steal the information, damage, or destroy the database - just by typing on the screen.
You definitely shouldn't do that (particularly if this is a web-based app where the whole world has access to it) - use Parametrized queries instead.

varun150 31-Jan-15 7:22am

if i get date by datetime.now then its ok but
i took this date value from jqueryui datepicker and when it raised out of range excepion then i converted to specific format. is there something more easy and better?
i pass parameters to store proc and this stored proc does transactions i do not pass sql Querystring to database as it makes my pages a bit slow but i didnt knew sqlinjection thing .
thankyou soo much for guiding me.
is there anything else i can do for sake of best practice.