如果第二天是第二天，则两个时间跨度之间的差额

Question

Let's say I have 2 timespans (24h format) in C#:

TimeSpan start = TimeSpan.Parse("22:11:00");
TimeSpan end = TimeSpan.Parse("01:54:12");
TimeSpan duration = end - start;

The problem is that the duration in this case is a negative number, far from the correct result. How to get the correct duration?

Answer 1

Take a look at the following Unit test

[DataRow("16:00", "01:00", "09:00")]
[DataRow("16:00", "21:00", "05:00")]
public void CalculateDuration(string open, string close, string expected) {
    var begin = TimeSpan.Parse(open);
    var end = TimeSpan.Parse(close);

    var actual = end < begin ? (TimeSpan.FromHours(24) - begin) + end : end - begin;

    Assert.AreEqual(TimeSpan.Parse(expected), actual);
}

Answer 2

您可以使用Duration（）方法：

TimeSpan duration = (start - end).Duration();

Answer 3

TimeSpan duration = end - start;

不 ： start - end 。