monthlyTime = Utilities.createShortTextField();
PlainDocument plainTextDocument = new PlainDocument();
monthlyTime.setDocument(plainTextDocument);
monthlyTime.setColumns(4);
monthlyTime.setText("00:00");
plainTextDocument.setDocumentFilter(new TimeDocumentFilter(monthlyTime));
lMonthlyDays = Utilities.createPrimaryLabel(INFO_CTRL_PANEL_DAYS.get());
gbc.anchor = GridBagConstraints.WEST;
panel.add(lMonthlyTime, gbc);