在VB.NET中两个日期之间的时间跨度 [英] Timespan between two dates in VB.NET

问题描述

使用时间跨度计算vb.net中两个日期之间的天数差异



我尝试了什么：

calculate number of days difference between two dates in vb.net using timespan

What I have tried:

Dim d1 As DateTime = "01-Sep-2017"
Dim d2 As DateTime = "30-Sep-2017"
Dim TTF As New TimeSpan
TTF = d2.Subtract(d1)
TTF.TotalDays
TotalDays is 29 days

Dim d1 As DateTime = "15-Sep-2017"
Dim d2 As DateTime = "30-Sep-2017"
Dim TTF As New TimeSpan
TTF = d2.Subtract(d1)
TTF.TotalDays
TotalDays is 15 days

Why difference between  "01-Sep-2017" and "30-Sep-2017" 29 days not 30 days because difference between "15-Sep-2017" and "30-Sep-2017" is 15 days. i want number of days between two days.

推荐答案

引用：

为什么01-Sep-2017和2017年9月30日之间的差异是30天

Why difference between "01-Sep-2017" and "30-Sep-2017" is 30 days

嗯。根据你的例子，它不是：

Um. It isn't, according to your example:

Dim d1 As DateTime = "01-Sep-2017"
Dim d2 As DateTime = "30-Sep-2017"
Dim TTF As New TimeSpan
TTF = d2.Subtract(d1)
TTF.TotalDays
TotalDays is 29 days

如果我理解你，你想要包括这一天结束了时间段。所以，你必须在结果中加1。

OriginalGriff已经在回答的评论中提到了（但换句话说）。

If i understand you well, you want to include the day, which ends time period. So, you have to add 1 to the result.
OriginalGriff has already mentioned that (but in other words) in the comment to his answer.

引用：

OriginalGriff 2小时10分钟前

回复

[修改评论。] [删除评论。]

这就是你得到的。

30 - 15 == 15

30 - 1 == 29.

为什么你会期望它有什么不同？

如果你想要一个月的天数，你需要从A +月的第一个月中减去A月的第一个 1不是第一个月A从月末A

OriginalGriff 2hrs 10mins ago
Reply
[Modify the comment.] [Delete the comment.]
And that is what you get.
30 - 15 == 15
30 - 1 == 29.
Why would you expect it to be any different?
If you want the number of days in a month you need to subtract "first of month A" from "first of month A + 1" not "first of month A" from "last of month A"

检查：

Check this:

Dim d1 As DateTime = "01-Sep-2017"
Dim d2 As DateTime = "30-Sep-2017"

Dim result = (d2-d1).TotalDays + 1

Console.WriteLine("The difference between date: {0} and {1} is {2} days.", d1, d2, result)

我强烈建议您阅读：执行算术运算日期和时间| Microsoft Docs [ ^ ]

代码总共返回29天，您可以在30天内分享更多详细信息吗？

The code returns 29 total days, can you share more details where you are seeing 30 days?

Dim d1 As DateTime = "01-Sep-2017"
Dim d2 As DateTime = "30-Sep-2017"
Dim TTF As New TimeSpan
TTF = d2.Subtract(d1)
TTF.TotalDays

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