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Default locale settings formatting a datetime instance

I need to use string.Format("{0}", DateTimeInstance) in a server application running on iis. I was sure that the format applied was the one of the server but i find out that the date is formatted as dd/MM/yyyy... some times and MM/dd/yyyy other times. I am guessing this depends by the client (the browser connected) settings. Is this possible? If yes, can I override this behaviour and force the server settings, without specifing a format?

Why does date format changes to month first in date time object?

In a web application, I am passing datetime without formatting it in a XML response, just item.Date (DateTime datatype) is put in code.
No formatting is done. When I run the local server it returns the date in MM/DD/YYYY format and in live environment DD/MM/YYYY. Why this change is happening?
I checked on database collation and OS settings. Live environment had English (Singapore) in regional settings. However after changing local servers to English (Singapore) still live environment DateTime format is not being produced locally.
Collation:
In Live Environment - Latin1_General_CI_AI
In Local Servers - SQL_Latin1_General_CP1_CI_AS
What could be the reason? how to resolve this rather than doing formatting in XML?
Update
As suspected, Issue is with collation, regenerated the issue locally after creating DB with collation in live environment.

Windows stores Date/Time settings per user. If IIS is running as LocalSystem, then you'll need to change the settings of the Default user:
In regedit, go here and set the appropriate values up for the locale and format that you want.
HKEY_USERS\.DEFAULT\Control Panel\International
That said, handling dates and times types under the assumption of any given format is A Really Bad Idea.
If you need date/time in a specific format for display, interop or whatever you should format the date time appropriately with one of the available string formats.

How to resolve Date format change Issue after deployment in asp.net?

When I'm using DateTime in dd-MM-yyyy format.
When I debug my code at localhost its works fine.
But After deploying my ASP.NET web project on IIS server DateTime changes to mm-dd-yyyy format automatically.I'm facing many issues because of this problem.
I'm not able to find any solution, please let me know how can I solve this.
How can I get rid of this issue.?

1) Change the datetime format of your server from:
Control Panel -> Regional and Language Options -> Advanced
2) Open IIS and follow below steps: (For IIS7)
Click on you Website
Select .NET GLOBALIZATION option
From Culture tab, select required Culture and UI Culture.
Finally iisreset.

Your IIS probably has another Localization selected, than on your development machine.
Printing should be pretty simple if you specify the format: yourDate.ToString("dd.MM.yyyy");
Parsing a date has been a problem for me in the past. You can change the server settings or specify a CultureInfo directly in the code, like this:
DateTime.ParseExact(myDateString, "yyyyMMdd", CultureInfo.InvariantCulture, DateTimeStyles.None);

String was not recognized as a valid Date Time error on IIS

Greeting people...i develop a web..everything working fine till deployment...my question is - why is it this error appear? because if i run the web on Visual Studio Server
everything fine...but when i deploy and run it on IIS server suddenly this error
appear..why is people? really need some help here..
string tarikh = Convert.ToDateTime(txtTarikh.Text).ToString("yyyy-MM-dd");
the line is where the cause of error..thanks in advance

For this problem you have to go to the IIS
Go to IIS -> Select your Configured Website -> Click on .NET Globalization
From .NET Globalization, select Culture and UI- Culture as English (United State) (en – US)
Restart IIS by running command as iisreset through windows command prompt
Check application is giving same problem or not

Chances are the server-side default culture is different to the one you've been using in development.
What format are you expecting the date to be in, anyway? You should either use DateTime.TryParseExact or at least use DateTime.TryParse specifying the appropriate CultureInfo. (For example, the culture of the user.)
Likewise I would suggest that you supply an appropriate CultureInfo to ToString - possibly CultureInfo.InvariantCulture.

You have different "regional setting" on your development machine and the web server.
Instead of calling Convert.ToDateTime(string), you could try to use the overloaded version Convert.ToDateTime(string, IFormatProvider) and specify in what format you expect the date to be in.
Some of us thinks that today's date is "2012-04-22" while other claims it is "4/22/2012" etc...
EDIT: Just do something like:
var ci = new CultureInfo("xx-XX");
var dateTime = Convert.ToDateTime(txtTarikh.Text, ci);
Where xx-XX is the code of the culture you want to work with. Look it up here:
http://sharpertutorials.com/list-of-culture-codes/

Because the date you get from txtTarikh.Text is not parsed as date.
Probably on your local machine, your regional settings are different from your server.
Add a log and print txtTarikh.Text to see what returns at your server and also on your local machine.

Issue is resolved by setting up .net globlization settings in IIS

<system.web>
<globalization requestEncoding="utf-8" responseEncoding="utf-8" fileEncoding="utf-8" culture="en-US" uiCulture="en-US" />
</system.web>
change these lines in web.config and publish it again.. It worked for me.

.NET DateTime object string format

This has got me really flumoxed!
In the datalayer ADO.NET connects to SQL Server 2008, Default language for the login is 'british'
Selects a DateTime column into a dataview and returns it.
aspx page databinds
this: <%# String.Format("{0:MMM/yyyy}", Eval("dbPeriodFrom")) %>
The database returns 2009/10/01 (This is yyyy/MM/dd)
The result of step 4 is Jan2009 ????
The regional settings of the web server is United Kingdom
There is no <globalization... section in machine.config
The NET globalisation in IIS is set to uiCulture=en culture=en-GB
I even set it in the web.config for the site
This is a classic "Works on my dev machine.." But, borked when deployed to production scenario.
What could I possibly have missed?
EDIT
So it appears the login used by the ASP.NET Application to connect to SQl Server 2008 is getting a US datetime, even though in the properties for the login, the default language is set to 'British English'.
The problem occurs in TSQL:
SELECT
DATEPART(month, CAST('2009.02.01' AS DATETIME))
,DATEPART(month, CONVERT(DATETIME, '2009.02.01', 102))
OUTPUT for windows integrated login (Administrator) with default language set to 'English'
2 2
OUTPUT for SQL Server login used by ASP.NET with default language set to 'British English'
1 2

Check the locale setting on the database itself and on their server, depending on the set up, the date will be formatted accordingly to the locale setting. I suspect the database server is probably set up to US English - Poke around in the regional settings on the db server itself.
Hope this helps,
Best regards,
Tom.

I'd be interested in seeing the code where you get the date out of the command/reader/adapter - if the database column is typed as a datetime, then what comes over the wire isn't actually "2009/10/01" - it is a binary number (like most dates are on the wire). As such there is no ambiguity.
I expect that somewhere you are treating it as a string (perhaps some Parse) - this shouldn't be necessary. If it is, you aren't SELECTing it as a datetime, but as a [n][var]char(x).

Check value stored in database using Management Studio. Also in MS SQL server universal format of date is YYYY-MM-DDTHH:MM:SS.mmm (2009-01-05T10:12:55.001) and YYYYMMDD (20090105). Those formats parsed always the same, no matter which locale used by database.