Getting current culture day names in .NET

Question

Is it possible to get the CurrentCulture\'s weekdays from DateTimeFormatInfo, but returning Monday as first day of the week instea

Answer 1

If you are getting day names based on dates, it doesn't matter what day the week starts on; DateTimeFormat.DayNames identifies Sunday as 0, as does DateTime, no matter if weeks start on Thursday or what have you. :)

To get day name in English from a date:

string GetDayName(DateTime dt)
{
    return CultureInfo.InvariantCulture.DateTimeFormat.DayNames[(int)dt.DayOfWeek];
}

If for some reason you absolutely want to deal with the (magic value!) ints that underpin the DayOfWeek enumeration, just shift the index and take the modulus, hence mapping 0 => 6, 1 => 0, and so on:

string GetDayName(int dayIndex)
{
    return CultureInfo.InvariantCulture.DateTimeFormat.DayNames[(dayIndex + 6) % 7]; 
}