Calculate difference between two Times in ASP.Net using C# and VB.Net

Hi democloud,

Please refer below sample.

HTML

<div>
    Start:
    <asp:TextBox runat="server" ID="txtTime1" />
    End:
    <asp:TextBox runat="server" ID="txtTime2" />
    <asp:Button Text="Calculate" runat="server" OnClick="Calculate" />
</div>

Code

C#

protected void Calculate(object sender, EventArgs e)
{
    DateTime d1 = DateTime.Parse(txtTime1.Text);
    DateTime d2 = DateTime.Parse(txtTime2.Text);
    TimeSpan timeFrom = TimeSpan.Parse(d1.ToString("HH:mm"));
    TimeSpan timeTo = TimeSpan.Parse(d2.ToString("HH:mm"));
    TimeSpan timeDiff;
    if (timeFrom.TotalSeconds > timeTo.TotalSeconds)
    {
        d2 = d2.AddDays(1);
        timeDiff = d2.Subtract(d1);
    }
    else
    {
        timeDiff = d2.Subtract(d1);
    }
    Response.Write(timeDiff);
}

VB.Net

Protected Sub Calculate(ByVal sender As Object, ByVal e As EventArgs)
    Dim d1 As DateTime = DateTime.Parse(txtTime1.Text)
    Dim d2 As DateTime = DateTime.Parse(txtTime2.Text)
    Dim timeFrom As TimeSpan = TimeSpan.Parse(d1.ToString("HH:mm"))
    Dim timeTo As TimeSpan = TimeSpan.Parse(d2.ToString("HH:mm"))
    Dim timeDiff As TimeSpan
    If timeFrom.TotalSeconds > timeTo.TotalSeconds Then
        d2 = d2.AddDays(1)
        timeDiff = d2.Subtract(d1)
    Else
        timeDiff = d2.Subtract(d1)
    End If
    Response.Write(timeDiff)
End Sub

Screenshot