C# 时间跨度到日期时间的转换
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TimeSpan to DateTime conversion
提问by Raghav55
I want to convert a Timespan to Datetime. How can I do this?
我想将时间跨度转换为日期时间。我怎样才能做到这一点？
I found one method on Google:
我在谷歌上找到了一种方法：
DateTime dt;
TimeSpan ts="XXX";
//We can covnert 'ts' to 'dt' like this:
dt= Convert.ToDateTime(ts.ToString());
Is there any other way to do this?
有没有其他方法可以做到这一点？
采纳答案by Arif Eqbal
It is not very logical to convert TimeSpan to DateTime. Try to understand what leppie said above. TimeSpan is a duration say 6 Days 5 Hours 40 minutes. It is not a Date. If I say 6 Days; Can you deduce a Date from it? The answer is NO unless you have a REFERENCE Date.
将 TimeSpan 转换为 DateTime 不是很合乎逻辑。试着理解 leppie 上面所说的。TimeSpan 是一个持续时间，比如 6 天 5 小时 40 分钟。它不是日期。如果我说 6 天；你能从中推断出日期吗？答案是否定的，除非您有参考日期。
So if you want to convert TimeSpan to DateTime you need a reference date. 6 Days & 5 Hours from when? So you can write something like this:
因此，如果要将 TimeSpan 转换为 DateTime，则需要一个参考日期。6天5小时从什么时候开始？所以你可以这样写：
DateTime dt = new DateTime(2012, 01, 01);
TimeSpan ts = new TimeSpan(1, 0, 0, 0, 0);
dt = dt + ts;
回答by NaN
You need a reference date for this to be useful.
您需要一个参考日期才能有用。
An example from http://msdn.microsoft.com/en-us/library/system.datetime.add.aspx
来自http://msdn.microsoft.com/en-us/library/system.datetime.add.aspx的示例
// Calculate what day of the week is 36 days from this instant.
System.DateTime today = System.DateTime.Now;
System.TimeSpan duration = new System.TimeSpan(36, 0, 0, 0);
System.DateTime answer = today.Add(duration);
System.Console.WriteLine("{0:dddd}", answer);
回答by Mike
While the selected answer is strictly correct, I believe I understand what the OP is trying to get at here as I had a similar issue.
虽然选择的答案是严格正确的，但我相信我理解 OP 试图在这里得到什么，因为我有一个类似的问题。
I had a TimeSpan which I wished to display in a grid control (as just hh:mm) but the grid didn't appear to understand TimeSpan, only DateTime . The OP has a similar scenario where only the TimeSpan is the relevant part but didn't consider the necessity of adding the DateTime reference point.
我有一个 TimeSpan，我希望在网格控件中显示它（就像 hh:mm），但网格似乎不理解 TimeSpan，只有 DateTime 。OP 有一个类似的场景，其中只有 TimeSpan 是相关部分，但没有考虑添加 DateTime 参考点的必要性。
So, as indicated above, I simply added DateTime.MinValue (though any date will do) which is subsequently ignored by the grid when it renders the timespan as a time portion of the resulting date.
因此，如上所述，我只是添加了 DateTime.MinValue（尽管任何日期都可以），当网格将时间跨度呈现为结果日期的时间部分时，它随后会被网格忽略。
回答by user2284452
A problem with all of the above is that the conversion returns the incorrect number of days as specified in the TimeSpan.
Using the above, the below returns 3 and not 2.
上述所有问题的一个问题是转换返回的天数与 TimeSpan 中指定的不正确。
使用上面的，下面的返回 3 而不是 2。
Ideas on how to preserve the 2 days in the TimeSpan arguments and return them as the DateTime day?
关于如何在 TimeSpan 参数中保留 2 天并将它们作为 DateTime 天返回的想法？
public void should_return_totaldays()
{
_ts = new TimeSpan(2, 1, 30, 10);
var format = "dd";
var returnedVal = _ts.ToString(format);
Assert.That(returnedVal, Is.EqualTo("2")); //returns 3 not 2
}
回答by Nomad77
First, convert the timespan to a string, then to DateTime, then back to a string:
首先，将时间跨度转换为字符串，然后转换为 DateTime，然后再转换回字符串：
Convert.ToDateTime(timespan.SelectedTime.ToString()).ToShortTimeString();
回答by Tony Thomas
TimeSpan can be added to a fresh DateTime to achieve this.
可以将 TimeSpan 添加到新的 DateTime 以实现此目的。
TimeSpan ts="XXX";
DateTime dt = new DateTime() + ts;
But as mentioned before, it is not strictly logical without a valid start date. I have encountered a use-case where i required only the time aspect. will work fine as long as the logic is correct.
但如前所述，如果没有有效的开始日期，这在严格意义上是不合逻辑的。我遇到了一个用例，我只需要时间方面。只要逻辑正确就可以正常工作。
回答by MiBol
An easy method, use ticks:
一个简单的方法，使用刻度：
new DateTime((DateTime.Now - DateTime.Now.AddHours(-1.55)).Ticks).ToString("HH:mm:ss:fff")
This function will give you a date (Without Day / Month / Year)
这个函数会给你一个日期（没有日/月/年）
回答by Paolo
If you only need to show time value in a datagrid or label similar, best way is convert directly time in datetime datatype.
如果您只需要在数据网格或类似标签中显示时间值，最好的方法是将时间直接转换为日期时间数据类型。
SELECT CONVERT(datetime,myTimeField) as myTimeField FROM Table1
SELECT CONVERT(datetime,myTimeField) as myTimeField FROM Table1
回答by Arun Prasad E S
var StartTime = new DateTime(item.StartTime.Ticks);
回答by user2825546
You could also use DateTime.FromFileTime(finishTime) where finishTme is a long containing the ticks of a time. Or FromFileTimeUtc.
您还可以使用 DateTime.FromFileTime(finishTime)，其中 finishTme 是包含时间刻度的 long。或 FromFileTimeUtc。
