Calculating elapsed time

[Pachalo]

Morning...

Am working on a simple billing system and a looking for a code that can help calculate the difference in time between sessions..(am using VB.Net )

This is what is happening:

l have a :
combobox named combobox1
textbox named txttotalamount
btnStart
Timer 1
btnEnd

Under btnStart l have the following code:

Me.Timer1.Start()
            Me.Timer1.Start()
            Me.Timer1.Enabled = True

and under btnEnd l have the following code:

        Me.Timer1.Stop()
        Me.txtTotaltime.Text = m_seconds.ToString()
        Dim number1 As Integer
        Dim number2 As Integer
        Dim answer As Integer
        number1 = txtTotaltime.Text
        number2 = ComboBox1.Items.Count
        answer = number1 * number2
        MsgBox(answer)

What l want is that l should be able to use the system time..if the system time is 12:01 that should be my start time and my end time should also be taken from the system..the counting should be in minutes..please help me

[jg007]

depending on what you are trying to do you might find it easier to use the ' stopwatch ' class

[jg007]

you can also do subtract one date value from another to return a timespan value and then extract the minutes

 elapsed = TimeEnd - TimeStart

 totalmin = elapsed.TotalMinutes

[puremelon]

Timespan that goes to next date showing negative value.

I have a web app that post response time between a start and stop time I am using timespan and when the interval goes to the next date it shows an incorrect negative value. Also I am only displaying whole numbers rounded to nearest minute.

Can anyone help with times that surpass midnight and go into next day? Any help Appreciated.
''StartDatetime and StopDateTime difference is written to me.alarmlocid.t ext (#) removes the .000etc

Dim dteStartDateTime As Date = CDate(Me.StartDateTime().Text)
Dim dteStopDateTime As Date = CDate(Me.StopDateTime().Text)
Dim tsTimeSpan As Timespan
Dim iTotalTime As Double

tsTimeSpan = dteStopDateTime.Subtract(dteStartDateTime)
 
iTotalTime = tsTimeSpan.TotalMinutes

Me.AlarmLocId.Text = iTotalTime.ToString("#")

[Plater]

I have never had an issue with TimeSpans not being able to handle going on to the next day.
I would think it has something to do with using the wrong objects. You should be using DateTime objects, not Date objects.
What values are in Me.StartDateTim e().Text and Me.StopDateTime ().Text exactly?
Does CDate provide the same functionality as the .NET equiv of DateTime.Parse( ) ?