C# compare two DateTimes

Question

I have two dates:

DateTime date_of_submission = Convert.ToDateTime(DateTime.Now.ToString("MM/dd/yyyy"));
DateTime _effective_date = Convert.ToDateTime(TextBox32.Text);

Now the effective date cannot be more than 90 days in the future from date of submission.

How can I do this comparison?

One method that comes to mind is a naive convert date times to strings and then compare dd, mm, yyyy and see if both dates are within 90 days of each other. But I believe there has to be a better solution than that.

Answer 1

You can subtract two dates, and get a TimeSpan :

TimeSpan difference = _effective_date - date_of_submission;
if(difference.TotalDays > 90)
{
  // Bingo!
}

Answer 2

var days = (_effective_date - date_of_submission).Days;