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Published 4th March 2010 by

This snippet will calculate the date of the start of the week from a given DateTime and return a DateTime containing the week commencing date.
public static DateTime GetWeekCommencing(DateTime date)
  CultureInfo info = Thread.CurrentThread.CurrentCulture;
  DayOfWeek firstday = info.DateTimeFormat.FirstDayOfWeek;
  DayOfWeek today = info.Calendar.GetDayOfWeek(date);

  int diff = today - firstday;
  DateTime firstDate = date.AddDays(-diff);
  return firstDate;

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