need to convert time to minutes in userform

You're missing some parens in the calculation.

What is the format of the data in the textboxes?

time will be entered in the text boxes as (txtstart1) 11:00 (txtend1) 14:00

txtmin1 should then equal 180

ah yes, the parenthesis in the calculation. I havent got that far, I get an error telling me that 11:00 makes a lousy integer.

Heres the actual error I get when I run it

Run-time error '13':

and when I debug, this is highlighted

endnum1 = txtend1.Value

That too.

I can't test this at all without making a form, so ...

Private Sub txtend1_Exit(ByVal Cancel As MSForms.ReturnBoolean)
    Dim dtEnd   As Date
    Dim dtBeg   As Date

    With frmquota.txtend1
        If .Value = "" Then
            dtEnd = 0
        Else
            If IsDate(.Value) Then
                dtEnd = CDate(.Value)
            Else
                .SetFocus
                MsgBox "Invalid end time!"
            End If
        End If
    End With
    
    With frmquota.txtstart1
        If .Value = "" Then
            dtBeg = 0
        Else
            If IsDate(.Value) Then
                dtBeg = CDate(.Value)
            Else
                .SetFocus
                MsgBox "Invalid start time!"
            End If
        End If
    End With

    txtmin1.Value = (dtEnd - dtBeg) * 1440
End Sub

That works great, thank you very much.