What is the number of days between two dates?

Question

We want to find the number of days between two dates. This is simple when the dates are in the same year.

Is there a built-in way to do this if the dates are in different years, or do we just have to loop through each year?

Answer 1

Subtracting a date from another yields a TimeSpan. You can use this to determine the number of whole days using the Days property, or whole and fractional days using the TotalDays property.

DateTime start = ...;
DateTime end = ...;

int wholeDays = (end - start).Days;

or

double totalAndPartialDays = (end - start).TotalDays;

Answer 2

you can probably do something like:

TimeSpan ts = endDate - startDate;
ts.Days

Answer 3

What are you missing?

DateTime - DateTime => Timespan

and Timespan has Days and TotalDays properties.

Answer 4

    DateTime date1 = DateTime.Now;
    DateTime date2 = new DateTime(date1.Year - 2, date1.Month, date1.Day);

    Int32 difference = date1.Subtract(date2).Days;