c# - 如何从给定日期获取一年中的总天数

Question

我想获得从给定日期起一年中剩下的总天数。假设如果用户给出04-01-2011(MM-DD-YYYY)我想找到剩余的天数。这个怎么做..

Answer 1

假设日期是今天：

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包含天数（感谢@Tung）。lastdate还包含该年的最后日期。

Answer 2

也许只是：

DateTime.IsLeapYear(DateTime.Now.Year) ? 366 : 365

对不起，读起来好像你只是想要当年的天数......

Answer 3

应该做的伎俩

int daysLeft = new DateTime(DateTime.Now.Year, 12, 31).DayOfYear - DateTime.Now.DayOfYear;

Answer 4

new DateTime(suppliedDate.Year, 12, 31).Subtract(suppliedDate).TotalDays

Answer 5

我认为您应该尝试 TimeSpan 之类的

 DateTime startTime = DateTime.Now;

 DateTime endTime = DateTime.Now.AddSeconds( 75 );

 TimeSpan span = endTime.Subtract ( startTime );
 Console.WriteLine( "Time Difference (seconds): " + span.Seconds );
 Console.WriteLine( "Time Difference (minutes): " + span.Minutes );
 Console.WriteLine( "Time Difference (hours): " + span.Hours );
 Console.WriteLine( "Time Difference (days): " + span.Days );

Answer 6

取一些开始日期，加上一年减去一天，然后从开始日期中减去结束日期，您将得到两个日期之间的总天数。

var beginOfYear = new DateTime(2000, 01, 01, 0, 0, 0, DateTimeKind.Local);
var endOfYear = beginOfYear.AddYears(1).AddDays(-1);
var daysOfYear = endOfYear.Subtract(beginOfYear).TotalDays;