how to calculate number of weeks given 2 dates?

Question

I have two DateTime variables and i need to compute number of weeks between them.

What is the quickest (and correct) way to do this?

Answer 1

public static int NumberOfWeeks(DateTime dateFrom, DateTime dateTo)
{
   TimeSpan Span = dateTo.Subtract(dateFrom);

   if (Span.Days <= 7)
   {
      if (dateFrom.DayOfWeek > dateTo.DayOfWeek)
      {
         return 2;
      }

      return 1;
   }

   int Days = Span.Days - 7 + (int)dateFrom.DayOfWeek;
   int WeekCount = 1;
   int DayCount = 0;

   for (WeekCount = 1; DayCount < Days; WeekCount++)
   {
      DayCount += 7;
   }

   return WeekCount;
}