Question

Is it possible to get the CurrentCulture‘s weekdays from DateTimeFormatInfo, but returning Monday as first day of the week instead of Sunday. And, if the current culture isn’t English (i.e. the ISO code isn’t “en”) then leave it as default.

By default CultureInfo.CurrentCulture.DateTimeFormat.DayNames returns:

[0]: "Sunday"
[1]: "Monday"
[2]: "Tuesday"
[3]: "Wednesday"
[4]: "Thursday"
[5]: "Friday"
[6]: "Saturday" 

But I need:

[0]: "Monday"
[1]: "Tuesday"
[2]: "Wednesday"
[3]: "Thursday"
[4]: "Friday"
[5]: "Saturday" 
[6]: "Sunday"

Answer 1

You can use custom cultures to create a new culture based off an existing one. To be honest, though, I’d say that’s probably a bit heavy-handed. The “simplest” solution may just be something like:

public string[] GetDayNames()
{
    if (CultureInfo.CurrentCulture.Name.StartsWith("en-"))
    {
        return new [] { "Monday", "Tuesday", "Wednesday", "Thursday",
                        "Friday", "Saturday", "Sunday" };
    }
    else
    {
        return CultureInfo.CurrentCulture.DateTimeFormat.DayNames;
    }
}