我发现这个问题已经在Java、JavaScript和PHP中得到了解答,但c#中没有。那么,如何在c#中计算两个日期之间的天数呢?


当前回答

首先声明一个稍后会返回的类:

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();
}

使用按钮控件调用上面的类。这里有一个例子:

其他回答

你可以使用下面的代码:

 int DateDifInSecond = EndDate.Subtract(StartDate).TotalSeconds
// Difference in days, hours, and minutes.

TimeSpan ts = EndDate - StartDate;

// Difference in days.

int differenceInDays = ts.Days; // This is in int
double differenceInDays= ts.TotalDays; // This is in double

// Difference in Hours.
int differenceInHours = ts.Hours; // This is in int
double differenceInHours= ts.TotalHours; // This is in double

// Difference in Minutes.
int differenceInMinutes = ts.Minutes; // This is in int
double differenceInMinutes= ts.TotalMinutes; // This is in double

你也可以得到秒、毫秒和滴答的差异。

date格式为"dd/MM/yyyy"

  string[] d1 = txtFromDate.Values.Split('/');
  string[] d2 = txtToDate.Values.Split('/');

  DateTime FrmDt = new DateTime(Convert.ToInt32(d1[2]), Convert.ToInt32(d1[1]), Convert.ToInt32(d1[0]));
  DateTime ToDt = new DateTime(Convert.ToInt32(d2[2]), Convert.ToInt32(d2[1]), Convert.ToInt32(d2[0]));

  TimeSpan TDiff = ToDt.Subtract(FrmDt);
  String DaysDiff = TDiff.TotalDays.ToString();

对于a和b作为两个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();

假设StartDate和EndDate是DateTime类型:

(EndDate - StartDate).TotalDays