I have a form with two DateTimePicker controls. dtpDate has the Format property set to Long and dtpTime has the Format property set to Time and ShowUpDown set to True.
I created one check box chkDT but you could create a check box for each control.
Private Sub chkDT_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles chkDT.CheckedChanged
If chkDT.Checked = True Then
dtpDate.Value = Now
dtpTime.Value = Now
dtpDate.Enabled = False
dtpTime.Enabled = False
Else
dtpDate.Enabled = True
dtpTime.Enabled = True
End If
End Sub
Hope this helps.