C# 计算两个日期之间的差异（天数）？
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Calculate difference between two dates (number of days)?
提问by leora
I see that this question has been answered for Java, JavaScript, and PHP, but not C#. So, how might one calculate the number of days between two dates in C#?
我看到Java、JavaScript和PHP已经回答了这个问题，但 C# 没有。那么，如何在 C# 中计算两个日期之间的天数？
采纳答案by Greg Beech
Assuming StartDateand EndDateare of type DateTime:
假设StartDate和EndDate类型为DateTime：
(EndDate - StartDate).TotalDays
回答by Vitaliy Liptchinsky
Use TimeSpan object which is the result of date substraction:
使用 TimeSpan 对象，它是日期减法的结果：
DateTime d1;
DateTime d2;
return (d1 - d2).TotalDays;
回答by pyrocumulus
I think this will do what you want:
我认为这会做你想做的：
DateTime d1 = DateTime.Now;
DateTime d2 = DateTime.Now.AddDays(-1);
TimeSpan t = d1 - d2;
double NrOfDays = t.TotalDays;
回答by Philip Wallace
DateTime xmas = new DateTime(2009, 12, 25);
double daysUntilChristmas = xmas.Subtract(DateTime.Today).TotalDays;
回答by sangeetha
protected void Calendar1_SelectionChanged(object sender, EventArgs e)
{
DateTime d = Calendar1.SelectedDate;
// int a;
TextBox2.Text = d.ToShortDateString();
string s = Convert.ToDateTime(TextBox2.Text).ToShortDateString();
string s1 = Convert.ToDateTime(Label7.Text).ToShortDateString();
DateTime dt = Convert.ToDateTime(s).Date;
DateTime dt1 = Convert.ToDateTime(s1).Date;
if (dt <= dt1)
{
Response.Write("<script>alert(' Not a valid Date to extend warranty')</script>");
}
else
{
string diff = dt.Subtract(dt1).ToString();
Response.Write(diff);
Label18.Text = diff;
Session["diff"] = Label18.Text;
}
}
回答by kingPuppy
In case someone wants numer of whole days as a double (a, bof type DateTime):
如果有人希望将整日数作为双倍（a,b类型DateTime）：
(a.Date - b.Date).TotalDays
回答by Pratyush Dhanuka
For aand bas two DateTimetypes:
对于a和b作为两种DateTime类型：
DateTime d = DateTime.Now;
DateTime c = DateTime.Now;
c = d.AddDays(145);
string cc;
Console.WriteLine(d);
Console.WriteLine(c);
var t = (c - d).Days;
Console.WriteLine(t);
cc = Console.ReadLine();
回答by Muba
First declare a class that will return later:
首先声明一个稍后返回的类：
public void date()
{
Datetime startdate;
Datetime enddate;
Timespan remaindate;
startdate = DateTime.Parse(txtstartdate.Text).Date;
enddate = DateTime.Parse(txtenddate.Text).Date;
remaindate = enddate - startdate;
if (remaindate != null)
{
lblmsg.Text = "you have left with " + remaindate.TotalDays + "days.";
}
else
{
lblmsg.Text = "correct your code again.";
}
}
protected void btncal_Click(object sender, EventArgs e)
{
date();
}
Use a button control to call the above class. Here is an example:
使用按钮控件调用上述类。下面是一个例子：
回答by Rohidas Kadam
You can try this
你可以试试这个
EndDate.Date.Subtract(DateTime.Now.Date).Days
回答by Darren
The top answer is correct, however if you would like only WHOLE days as an int and are happy to forgo the time component of the date then consider:
最佳答案是正确的，但是如果您只希望整整几天作为整数并且乐于放弃日期的时间部分，那么请考虑：
(EndDate.Date - StartDate.Date).Days
Again assuming StartDateand EndDateare of type DateTime.
再次假设StartDate和EndDate是 类型DateTime。
