Most efficient way to count number of weeks between two datetimes [closed]

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Exactly as it says on the tin, I just need the most efficient way of counting weeks (i.e. 7-day spans, not calendar weeks) between two dates in C#.

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Get the number of days and divide by 7.

int weeks = (date1 - date2).TotalDays / 7;

You may well have a remainder of up to 6 days that will not be included in the number of weeks.

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I assume you want to get this on the basis of the Calender. For this you need System.Globalization

DateTime date1 = DateTime.Now;
DateTimeFormatInfo dinfo = DateTimeFormatInfo.CurrentInfo;
dinfo.Calendar.GetWeekOfYear(date1, CalendarWeekRule.FirstFullWeek, DayOfWeek.Monday)

Based on your need you have to set the Calender week rule and the first day of the week.

This gives you a week number for the calender. you can get the same for your other date, the difference is your weeks count

Hope this helps you.

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Try this to get the number of days:

TimeSpan ts = date1.Subtract(date2);
int dateDiff = ts.Days();

Then, like @Oded said, divide by 7

int totalWeeks = (int) dateDiff / 7;

Cheers!