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TheDahv/gist:1946234

Forked from smoak/gist:1945982
Created March 1, 2012 00:38
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gistfile1.cs
var groupedByWeek = new List<DateTime> {
new DateTime(2012, 02, 01),
new DateTime(2012, 02, 02),
new DateTime(2012, 02, 06),
new DateTime(2012, 02, 13)
}.
GroupBy(s => s.DayOfYear / 7).
ToDictionary(
s => (new DateTime(2012, 01, 01).AddDays((s.First().DayOfYear / 7) * 7)),
s => s.Count()
);
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