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Running this command 

CultureInfo.GetCultureInfo("en-US").DateTimeFormat.FirstDayOfWeek

in C# returns Sunday.

It should return Monday.

Why does it return Sunday?

ASh
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Michael Blok
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  • Why do you think it _should_ return Monday? – Soner Gönül Nov 23 '15 at 12:41
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    Your assertion is plainly incorrect. – spender Nov 23 '15 at 12:42
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    It follows the Jewish way to count the days of the week, so the week ends on Sabbat (Saturday) – TaW Nov 23 '15 at 12:44
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    I'm voting to close this question as off-topic because OPs original assertion is incorrect. – spender Nov 23 '15 at 12:46
  • Start day of work week and software weeks _can_ be different concepts. From https://en.wikipedia.org/wiki/Gregorian_calendar#Week: _Opinions vary about the numbering of the days of the week. ISO 8601, in common use worldwide, starts with Monday=1; printed monthly calendar grids list Mondays in the first (left) column of dates and Sundays in the last_. **Software often starts with** _Sunday=0, which places Sundays in the left column of a monthly calendar page_. You said _It should return Monday_ but you didn't _even_ explain _why_ it should. ++ – Soner Gönül Nov 23 '15 at 13:10
  • ++ This is similar as: "This program says UNICORNS are real but they should be unreal" but you didn't even explain or prove why. Since we all know, they ARE real. – Soner Gönül Nov 23 '15 at 13:10

1 Answers1

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As mentioned on this page

The Week and its Seven Days

According to the international standard ISO 8601, Monday is the first day of the week ending with Sunday as the seventh day of the week. Although this is the international standard, countries such as the United States still have their calendars refer to Sunday as the start of the seven-day week.

Thus your assumption that the US culture should have Monday returned via DateTimeFormat.FirstDayOfWeek is incorrect.

From Wikipedia:

Not all parts of the world consider the week to begin with Monday. For example, in some Muslim countries, the normal work week begins on Saturday, while in Israel it begins on Sunday. In the US, although the work week is usually defined to start on Monday, the week itself is often considered to start on Sunday.

Jason Evans
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