Difference between "en-GB" and "en-Us" cultures names

Question

When I write this code date set to something like that "12/12/2018 20:08" and it's ok

{
     var newCulture = new CultureInfo("en-GB");
     var date = (value as DateTime?)?.ToString(newCulture.DateTimeFormat.ShortDatePattern+" HH:mm", CultureInfo.InvariantCulture);
}

but when i change culture name to "en-Us" the result is "12.12.2018 20:08" (not right format as i know) -returning date format of ShortDatePattern is not right

I test it on another desktop, and there it works right with 2 of them. May be there is some kind of dependence on desktop settings? Why date formats are various?

I seem to remember some weird circumstance where the system would perform case sensitive comparisons rather than case insensitive ones when looking up cultures. Does anything change if you specify `en-US` instead of `en-Us`? You've also said that something is "not right" but not told us what you were expecting. — Damien_The_Unbeliever, Dec 11 '18 at 08:53
1. culture names are case sensitive - so `"en-Us"` should be `"en-US"`. 2. Day and month are reversed between these two cultures - GB it's `dd/mm/yyyy` and US is `mm/dd/yyyy`. — Zohar Peled, Dec 11 '18 at 08:56
Yes, desktop settings matter. Use Control Panel > Language > Change date, time and number formats. And talk to somebody about it, this was surely changed to fix some kind of problem for another program. — Hans Passant, Dec 11 '18 at 08:57
@Damien_The_Unbeliever You are probably thinking https://stackoverflow.com/q/53285491/11683 — GSerg, Dec 11 '18 at 08:58
@ВиталийСемененя See the [Control Panel Overrides](https://learn.microsoft.com/en-us/dotnet/api/system.globalization.cultureinfo?view=netframework-4.7.2#control-panel-overrides) section. — GSerg, Dec 11 '18 at 09:04
GSerg thank you so much!!! I should set useUserOverride to false! — Виталий Семененя, Dec 11 '18 at 09:04

score 3 · Accepted Answer · edited Dec 11 '18 at 09:13

new CultureInfo("en-GB") calls the ctor with useUserOverride set to true. This means that if you server environment has a match for the specified culture with custom settings those will be used instead of the default once. So to fix your issue CultureInfo("en-GB", false); or CultureInfo.GetCultureInfo("en-GB") (for a cached version)

The GetCultureInfo method retrieves a cached, read-only CultureInfo object. It offers better performance than a corresponding call to the CultureInfo.CultureInfo(String) constructor.

If name is the name of the current culture, the returned CultureInfo object does not reflect any user overrides. This makes the method suitable for server applications or tools that do not have a real user account on the system and that need to load multiple cultures efficiently.

Difference between "en-GB" and "en-Us" cultures names

1 Answers1