get number of weeks away from today

i have a date in the future and i want to find out how many weeks awa开发者_Python百科y this is.

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(futureDate - DateTime.Today).TotalDays / 7

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I think you'd be best getting the no of days and dividing that by 7

DateTime start = DateTime.Now;
DateTime end = DateTime.Now.AddDays(21);

double noOfDays = (end - start).TotalDays;
double noOfWeeks = noOfDays  / 7;