When I start my excel workbook I want a userform to pop up with the current
time highlighted in a textbox. I must be able to overwrite that text and copy
that value to a cell in a worksheet. How can I do this?

The point is to record the time a show up for work and put dates and time in
a worksheet.

Private Sub Workbook_Open()
UserForm1.Show
End Sub

Private Sub UserForm_Initialize()
TextBox1.Text = WorksheetFunction.Text(Now(), "hh:mm")
TextBox1.EnterFieldBehavior = fmEnterFieldBehaviorSelectAll
End Sub