How to get the total number of days in a year from the given date

Question

I would like to get the total number of days in a year left from the given date .. Assume if a user gives 04-01-2011(MM-DD-YYYY) I would like to find the remain

Answer 1

Let's say the date is today:

var user = "05-08-2012";
var date = DateTime.ParseExact(user, "MM-dd-yyyy", System.Globalization.CultureInfo.InvariantCulture);
var lastdate = new DateTime(date.Year, 12, 31);
var diff = lastdate - date;

diff.TotalDays contains the number of days (thanks @Tung). lastdate also contains the last date for the year.