日期范围（天）...... C＃

Question

I have a query that is calling an Oracle DB from C#. I want to write the query to get data that is, at most, 5 years old.

I currently have a hard coded value for public const int FIVE_YEARS_IN_DAYS = 1825;

But, this isn't correct because of leap years. Is there a function that will give me the correct number of days in the preceeding 5 years?

Answer 1

I think you want this:

DateTime now = DateTime.Now;    
now.AddYears(-5).Subtract( now ).Days

Answer 2

DateTime now = DateTime.Now;
TimeSpan fiveYears = now.Subtract(now.AddYears(-5));
int numberOfDaysInLastFiveYears = fiveYears.Days;

This will correctly account for leap years. Doing this right now yields 1,826 days.