How to subtract two different time in HH:mm:ss:fff format in VB.NET ?

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ASM

Public Class Form1
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        TextBox1.Text = Format(Now, "HH:mm:ss:fff") ' start button
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        TextBox2.Text = Format(Now, "HH:mm:ss:fff") ' end button
    End Sub

    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
        'subtract button
        TextBox3.Text = TextBox2.Text - TextBox1.Text
    End Sub
End Class

for the above code the following error is coming.

Conversion from string "12:00:03:554" to type 'Double' is not valid.

Posted 3-Mar-15 19:35pm

dipankarnalui

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Maciej Los · Answer 1 · 2015-03-03T19:51:00

Solution 1

Do not format string for start and end button. Use Date.Now with the date and time.
To be able to get time difference, use DateDiff[^] function.

Another way is to use TimeSpan[^] structure.

Posted 3-Mar-15 19:51pm

Maciej Los

Updated 3-Mar-15 19:53pm

v2

Comments

dipankarnalui 4-Mar-15 2:50am

Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click

Dim x As Date

Dim y As Date

x = DateTime.Now
TextBox1.Text = x

System.Threading.Thread.Sleep(5000)

y = DateTime.Now
TextBox2.Text = y
Dim SecondsDifference As Integer

SecondsDifference = DateDiff(DateInterval.Second, x, y)

TextBox3.Text = SecondsDifference.ToString()

End Sub

i dnt want TextBox1.Text = 04-Mar-15 1:11:59 PM this format. i want TextBox1.Text =1:11:59:300 in this format. for text box 2 also same format .. and the output(textbox3) also in same format

dipankarnalui 4-Mar-15 3:05am

i want to remove AM/PM and date .. only time hh:mm:ss:mm is needed and the difference between two times also will be in the same format hh:mm:ss:mm.