Week numbers

Week numbers are not used in the US who it is pointless to start
thinking about how weeks might be numbered there. I do not know
if week numbers are in use in Asia, but I do not think so.

That leaves Europe[*] and the name of the game is ISO 8601 and The Right
Answer[tm] therefore is:

Week number of 24/12/2005: 51
Week number of 25/12/2005: 51
Week number of 26/12/2005: 52
Week number of 27/12/2005: 52
Week number of 28/12/2005: 52
Week number of 29/12/2005: 52
Week number of 30/12/2005: 52
Week number of 31/12/2005: 52
Week number of 1/1/2006: 52
Week number of 2/1/2006: 1
Week number of 3/1/2006: 1
Week number of 4/1/2006: 1
Week number of 5/1/2006: 1
Week number of 6/1/2006: 1
Week number of 7/1/2006: 1

as dumped by

static void
dump (int d, int m, int y)
{
	GDate *gd = g_date_new ();
	g_date_set_dmy (gd, d, m, y);
	printf ("Week number of %d/%d/%d: %d\n",
		d, m, y,
		g_date_get_iso8601_week_of_year (gd));
	g_date_free (gd);
}

So there you have it: all weeks are seven days long (what a concept!)
and go from Monday to Sunday. The first week of 2006 starts on the second day of January 2006.

[*] Thus assuming that no-one in Africa, for example, has been
stupid
enough to invent their own date magic for no good reason.

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